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Description
Ultimate Ears BOOM 4 Portable Waterproof Bluetooth Speaker With 360-Degree, Bold, Immersive, Crystal-Clear Sound, Floating Speaker With 15-Hour Battery and 147ft (45m) Range, LilacMeet the Ultimate Ears BOOM 4, a compact powerhouse that brings bold, immersive sound to your everyday adventures. In a striking Lilac finish, this portable Bluetooth speaker blends a resilient, floating design with UEs renowned audio processing to deliver crystal clear, balanced audio at any volume. Whether youre by the pool, on a hike, or kicking back in the living room, BOOM 4 fills the space with 360 degree sound that stays faithful to your
Meet the Ultimate Ears BOOM 4, a compact powerhouse that brings bold, immersive sound to your everyday adventures. In a striking Lilac finish, this portable Bluetooth speaker blends a resilient, floating design with UE’s renowned audio processing to deliver crystal-clear, balanced audio at any volume. Whether you’re by the pool, on a hike, or kicking back in the living room, BOOM 4 fills the space with 360-degree sound that stays faithful to your music—from delicate treble details to punchy bass lines. Built to travel, it’s waterproof, durable, and buoyant, so you can take the music with you across water, sand, and city streets without missing a beat. With up to 15 hours of battery life and an impressive 147-foot (45-meter) wireless range, you can enjoy hours of uninterrupted playback and freedom to move. Add to that its seamless pairing with other UE speakers for bigger, immersive soundscapes and you’ve got a speaker that’s ready for spontaneous parties, intimate gatherings, or late-night listening sessions. The Lilac color brings a playful, modern touch to any setup—whether it sits on a shelf, clips to a backpack, or floats at the edge of a pool while you sing along to your favorite tracks.
- 360-degree immersive sound powered by Ultimate Ears’ signature audio processing, delivering clear, balanced audio with faithful reproduction of your music at every volume. Enjoy wide, room-filling sound that envelops you from every angle, whether you’re hosting a party or enjoying a quiet playlist on the go.
- Floating, waterproof design built to ride the waves of your day. The BOOM 4 is engineered to withstand outdoor elements and water exposure, and its buoyant construction means it can float—ideal for poolside hangs, boating trips, or beach adventures where you want music and fun to stay afloat together.
- Long-lasting battery life with up to 15 hours of continuous playback on a single charge. That means more listening, less worrying about recharging, and more time to focus on the music you love—whether you’re singing along during a road trip or hosting a backyard barbecue into the night.
- Extended Bluetooth range up to 147 ft (45 m) for flexible, carefree listening. Move between rooms, roam around outdoors, or keep the party going in a different corner of the venue while your music stays connected and strong.
- Vibrant Lilac finish and user-friendly controls with a rugged, compact form factor designed for portability. The bold color stands out in any setting, and the tactile controls on top make play/pause, volume, and track changes quick and easy—so you stay in the moment without digging for your phone.
Techncial Details of Ultimate Ears BOOM 4
- Wireless connectivity: Bluetooth 5.0 for stable, energy-efficient streaming
- Wireless range: Up to 147 ft (45 m) for flexible playback and multi-room listening
- Battery life: Up to 15 hours of continuous playtime on a full charge
- Waterproof and floating design to handle outdoor use and water-based adventures
- Charging method: USB-C for reliable, fast charging and easy cable compatibility
How to install Ultimate Ears BOOM 4
- Charge the speaker using the included USB-C charging cable until the indicator shows a full charge.
- Power on the device by pressing and holding the power button until you hear a sound or see indicator lights ignite.
- Enable Bluetooth on your phone, tablet, or computer and select “Ultimate Ears BOOM 4” from the list of available devices to pair.
- For larger listening experiences, use PartyUp to connect BOOM 4 with other UE speakers and synchronize playback across multiple devices for wider, richer sound.
- Control playback with the top-mounted buttons for play/pause, track skipping, volume adjustment, and voice assistant access (depending on your device), then enjoy your music hands-free while the speaker remains ready for spontaneous adventures.
Frequently asked questions
- Is the BOOM 4 waterproof and does it float? Yes. The BOOM 4 is designed to be waterproof and buoyant, making it suitable for poolside use, beach days, and outdoor adventures where water exposure is likely.
- How long does the battery last? The speaker delivers up to 15 hours of playback on a single charge, depending on volume, content, and ambient conditions. Real-world use may vary, but you can expect long listening sessions between charges.
- Can I connect multiple speakers? Absolutely. With PartyUp you can link BOOM 4 with other UE speakers to create a larger, more immersive audio experience for parties, gatherings, or multi-room listening.
- What charging method does it use? The BOOM 4 charges via USB-C, which supports fast charging and is compatible with many common USB-C adapters and power banks.
- Is there any built-in voice assistant? The BOOM 4 focuses on delivering powerful, portable sound and Bluetooth streaming. Voice assistant support depends on the connected device and software ecosystem; the speaker itself does not include a dedicated built-in voice assistant.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
Solid, powerful, rechargeable
Color: Black
Very impressed with its weight, speed and performance. The dial is great
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Reviewed in the United States on May 29, 2026
★★★★★ 4
Very nearly the perfect frother for all your basic frothing & mixing needs
Color: Black
There are a lot of middle-of-the-road frothers out there. I've been through a few of them in my recent search for something that could mix and froth well, without taking up any more outlets in my basement kitchen. Of the three Maestri frothers I've tried so far, this one wins the race by a nose.
Most recently, these Maestri frothers come in basically three versions: A single-speed @ 8000 RPM, a two-speed @8000/5500 RPM, and this stepless variable-speed version. Aside from that, the only real difference in recent version pack-outs is which attachments they come with.
Look over the reviews of the single-speed version and you'll find that while it can and does froth well, it starts at a single, high speed and gets there fast. This makes it pretty easy to spin liquid right out of most common cups and mugs.
There is a two-speed version, but it's harder to find, only comes in one color (Grape Purple), and while it's much better than the Maestri single-speed, it still has a couple of quirks that make this variable-speed version win out.
This mixes and froths whole milk, half-and-half, or heavy whipping cream, or just about anything else very well. Like all frothers, it takes a little time to learn its nuances and nail down the technique, this will definitely get you there.
The best feature of this is easily the speed control. Turn the knob to turn it on at a low speed that's great to get things started, then turn the knob to crank up the speed just enough to do what you need, whether that's mixing or frothing. The low starting speed makes it easy to keep things under control without undue spilling, and the max speed is more than enough to make quick work of getting your froth on.
There are really only two complaints I have with this stepless, variable speed version:
- I'd really like to have a Press On / Release Off button in addition to the Speed Control knob. More than one time have I gone to turn this off, only to spin the knob the wrong way and crank the speed up to ludicrous, sloshing liquid on the counter. Being able to turn it Off just by letting go of the button would be quick and easy. This configuration would allow using a preferred speed right from the start, while still allowing speed to be adjusted on-the-fly when needed.
- Give it a bigger battery. It would cost mere pennies to give this a 2000mAH+ instead of a 1200mAH battery, and I can't think of any reasonable downside to that.
- Give the motor a little more torque. It's fairly easy for the current motor, at any speed, to get bogged down in a thick protein powder mix, or when pressing the frother or other attachment a bit too hard into the bottom or side of the frothing container. A bit more "oomph" would prevent that.
I really like the overall design and features of thes Maestri frothers better than many other, cheaper versions. This variable-speed version is pretty great as it is and probably the one I would recommend over the single- or two-speed, for most people. But I often find myself using two hands -- one to hold it steady, and the other to turn it on and tweak the knob to the desired speed(s) -- for a device that should arguably need only one hand to use. Just a couple of minor tweaks as noted above would make this the overall best frother of its type that I've used.
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Reviewed in the United States on May 23, 2025
★★★★★ 5
Hands down, the BEST handheld frother I've ever used!
Color: Black
Hands down, the BEST handheld frother I've ever used! I got the black one, but any color will have the same results.
Over the past 12 years or so, I've used so many different handheld frothers and they've ALL fallen short of expectations for quality, longevity, power, features, and usability.
I've used everything from cheap, $15 models to $50+ models and everything in-between. Some with fancy attachments for various types of mixing, frothing, beating, whipping, etc. Some with rechargeable batteries, some without. Some AC powered, some with fixed whisks, some with detachable/replaceable whisks, some with stands, etc. NONE have been spectacular. Most broke within 6 months and got tossed. ALL were major disappointments in the end, including the "revered" Zulay models of which I tried several.
I finally found this Maestri House branded, variable speed frother with detachable / replaceable whisks and got one to try. I was literally on Cloud Nine the first time I turned it on. Like, WOW! Not only was it FAST on the highest speed, but it was powerful enough to churn right through milk, eggs, cream, etc, without bogging down like many others.
This thing makes milk froth like a milkshake and Matcha Lattes like nothing else I've ever experienced. I used to have to sift my Matcha, then whisk it in hot water, then froth milk and then blend them together to make the perfect latte. and if the milk was cold (my preference), pre-whisking in hot water was a must to avoid lumps. However, with THIS frother? I literally pour my milk into a tall tumbler, drop in un-sifted Matcha powder, and spin up the Maestri House frother at first on a medium low speed to get it mixed, then jump straight to the highest speed to really whip that milk and match up. After about 30-45 seconds, I've got the thickest, richest, smoothest, most aerated latte around. And NO LUMPS at all!!! What a time and dish saver!
And cleaning? I just run it under hot running water to get the shaft cleaned and then spin it up in a dish with hot running water for a few moments, then spin it on high for a few seconds in the air to dry it off instantly.
Now, I'll be honest here, too. The specs say it can go months on a charge, using it for a couple minutes a couple times daily. Well, I guess it could do that and still spin. But I use it FULL SPEED, churning hard for at least a minute a couple times per day. After about 2 weeks, I can start to notice a speed reduction so I just plug it back in on the charger. All things considered, this is still better than all the other handheld frothers I've used over the years.
After using the heck out of this thing for the past 7 months, I've even decided to start selling these in our Japanese gift shop. The manufacturer is has been very responsive both in customer support (I called them about an issue I thought I was having, and they called me back with a couple hours even though I didn't leave voicemail when they didn't answer right away) and in reseller support. I have to give these guys an A+ for responsiveness and quick resolution when problems might arise.
HIGHLY recommended!!
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Reviewed in the United States on October 17, 2025
★★★★★ 5
Great Addition!
Color: Black
Why did you pick this product vs others?:
I just started a powdered drink routine recently and was having a difficult time mixing it with water. I would consistently end up with small nuggets of mix making it unenjoyable to drink. I knew I needed a mixer and was glad I found this device when I did. It works perfectly! I like the fact that it comes with its own stand and included two mixing heads. It is solid, well-designed, and you can feel the quality when you pick it up. The variable speed of the mixer is perfect for ensuring that everything is blended well. I haven’t used it to “froth” anything yet, at least not on purpose, but I accidentally found out that it can do that well. This is a great addition to our kitchen and is very easy to wash after use. So far…no issues. Highly recommend for those of you looking for the right tool to make sure those protein mixes aren’t full of unmixed nuggets.
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Reviewed in the United States on June 21, 2025
★★★★★ 4
Low foam
Color: Black
Love this frother. It is great quality and the turn speed is amazing. My only issue is this. It comes w 2 wands and they are both singles. The single is great for stirring things up. It does not make a lot of froth and for some things it’s perfect but sometimes I like a lot of froth and I wish it either came w a single and a double or you could purchase a double separately to intermix. I don’t want to buy a whole other unit just for the double. I wrote to them bc the double frother they sell doesn’t look as good as this one but sometimes a girl needs a lot of foam and sometimes th stirring is perfect.
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Reviewed in the United States on February 20, 2026