SKU: 36836715347

SIM900A SIM 900A V4.0 Kit Wireless Extension Module GSMGPRS Board Antenna Tested Worldwide

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Description

SIM900A SIM 900A V4.0 Kit Wireless Extension Module GSMGPRS Board Antenna Tested WorldwideThe SIM card circuit to increase the SMF05C ESD chip. Antenna circuit: guarantee short and straight, so as to ensure the signal strength. PCB display screen printing mark: each interface, convenient development two times, the SIM900 A hardware is completely follow the design when the design manual. Two power supply interface: VCC5, 5V DC above 1A. Computer 5V power supply can be early computer USB. DC long data circuit over larger recommended 5V1A.

The SIM card circuit to increase the SMF05C ESD chip.
Antenna circuit: guarantee short and straight, so as to ensure the signal strength.
PCB display screen printing mark: each interface, convenient development two times, the SIM900/A hardware is completely follow the design when the design manual.
Two power supply interface: VCC5, 5V DC above 1A. Computer 5V power supply can be early computer USB. DC long data circuit over larger recommended 5V1A. VCC4, 3.5--4.5V power supply, ibid., suitable for lithium battery.
A TTL level, compatible with 3.3V and 5V.
The two antenna interface, the default SMA straight head, connector for IPXmini antenna.
One way of speech interface, the way Mike interface.
The control interface of each pin description:
GND - GND
SIMR SIM900A RXD, TTL level, can not be directly connected to the 232 level
SIMT SIM900A TXD, TTL level, can not be directly connected to the 232 level
RST - SIM900A reset, active low
VCC_MCU when the SIM900A module and 5V TTL level communication, this pin is connected to DC 5V; when the level of communication of SIM900A and 3.3V TTL, this pin is connected to DC 3.3V.
Onboard Resources:
Serial port circuit(with protection)
Antenna interface circuit(SMA bend female port)
SIM card circuit(flip SIM slot)
4*3.5 fixture hole 4pcs
SIM900A serial port output terminal
Dimensions & Weight: 5.6 cm x 4.9 cm x 2.8 cm/23 g

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Exchange/Return Notes
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SKU: 36836715347

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R. Nicholas Martin
New York, US
★★★★★ 5
Best watch for the retail price!
Color: 5885 blue dial
Ease of use: All you have to do is put it on and it's self-winding and you never ever need to worry about batteries or winding it up! It's pretty accurate time as well and looks good! It's the best watch I've ever owned for this price and I even bought my son one for himself!
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Reviewed in the United States on July 4, 2025
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Reese Wright
Omaha, US
★★★★★ 5
Real stainless band
Color: rose steel black dial, Color: rose steel black dial
My new favorite work watch. Wound up buying this after two failed attempts with other cheap watches from Wally world that turned my wrist black after the plating wore off in about three days. Learned my lesson. so far this thing keeps perfect time and does not turn my wrist black. Had to take a couple of links out for a perfect fit. So yeah, this will be the only brand of watch I will likely be buying from now on. Hope they’re around for a while. Update* January 8 2026. Oh no, I had such high hopes for this watch brand BUT, I only had this watch for two months when it started dry moisture inside the crystal. No I am not a diver nor have I had the watch fully submerged. This thing is not water resistant at all. It may be great for Desert dwellers or for people who never take showers or baths with it on. Going back to my old favorite Armitron.
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Reviewed in the United States on October 28, 2025
D
Verified Purchase
Doug Mayse
Lowell, US
★★★★★ 5
Great product
Color: brown Leather blue 2872
I love this watch! Great quality and looks great!
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Reviewed in the United States on November 6, 2024
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Dorita
Birmingham, US
★★★★★ 5
OLVST Watch
Color: men black watch 42, Color: men black watch 42
Very nice and elegant wristwatch. It feels light, comfortable on the wrist, and easy to wear. The time is clear and it works well for everyday use. Good value for the price.
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Reviewed in the United States on May 11, 2026
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Jeanie
Lexington, US
★★★★★ 5
Great quality and look!!!
Color: white watches for men 76, Color: white watches for men 76
Love the OLEVS watches!!! They are all great looking and of high quality!!! You can tell as soon as you put it on your wrist that it is of high quality. The displays are gorgeous and easy to read. The ones with stainless steel straps are easy to remove links to adjust fit. If you keep your eye on the daily and lighting deals, you can catch them with great deals.
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Reviewed in the United States on April 27, 2026

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