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GPRS GSM module SIM900A Wireless Extension Sensor Board with Antenna

15 reviews
73.3% of buyers enjoyed this product! 171 orders


8674 in stock

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Easy returns and refunds
Free shipping worldwide

Seven features of this product:
1.SIMCOM industrial-level module: SIM900A.
2.1000UF high quality tantalum capacitors, powerful filter power.
3.TVS anti-surge anti-interference circuit is suitable for industrial situations.
4. Curved wiring + high performance antenna, the signal is very strong.
5. Gold-plated connection (IPX) with good contact performance.
6. Welding process of industrial grade patch, stable welding spot.
7. Anti-static and shock-proof bubble bag packaging, transportation safety.

The eight functions are widely used:
1. Voice call function — telephone alarm.
2. Receiving – sending SMS messages – SMS controller, SMS alarm.
3.GPRS function – communicate with the server and send and receive data through traffic.
4.MMS function – MMS send pictures, security and only home suitable for use.
5.DTMF function – resolve the key value of each other in the call and remote control of the phone.
6.TTS function – speech synthesis {need to contact us
7.LBS function – base station positioning.
8. Bluetooth 3.0 function.

Pin description:
PWK– remove the short circuit point and drop down the switch.
DTR – DTR pin
RI – RING pin
RST— module reset.
TXD— connect to the RXD of MCU.
RXD— connect to the TXD of MCU.
GND – GND function
+5V– standard 5V power supply.
VBTA— connect lithium battery.
GND – GND function
NET— signal instructions.
D-R—–connect headphones-
D-T– connect the headset +.
SPKP—- connect the microphone –
MICP– connect microphone +.



Brand Name


Dissipation Power


Supply Voltage


Operating Temperature




Model Number



experimental modules




electronic module

Shipping and delivery

We are proud to offer international shipping services that currently operate in over 200 countries and islands worldwide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

How long does shipping take?

Shipping time varies by location. These are our estimates:

Location *Estimated Shipping Time
United States 10-30 Business days
Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.

My tracking says "no information available at the moment".

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you have specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.

Refunds & returns policy

Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:

  • You do not receive them within the guaranteed time (45 days not including 2-5 day processing)
  • You receive the wrong item
  • You do not want the product you have received (but you must return the item at your expense and the item must be unused)

We do not issue the refund if:

  • Your order does not arrive due to factors within your control (e.g. providing the wrong shipping address)
  • Your order does not arrive due to exceptional circumstances outside our control (e.g. not cleared by customs, delayed by a natural disaster)
  • Other exceptional circumstances outside the control of

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on page.

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

Real customer reviews

15 reviews
73.3% of buyers enjoyed this product!
5 stars
( 11 )
4 stars
( 0 )
3 stars
( 1 )
2 stars
( 0 )
1 star
( 3 )
  1. D***v

    The parcel came quickly, everything is fine.

  2. R***r

    fast, accurate, good 🙂

  3. M***R

    product didn’t arrive in time. made complain. store gave full refund. I commend him. will buy from him still

  4. N***n


  5. E***o

    Item is defective and opened dispute for refund.

  6. I***v


  7. G***a

    to day

  8. I***v

    The module stitched the latest firmware with simcom all works but there are certain problems it reacts to at commands only from the program putty

  9. I***s

    store shipped the item quickly and appreciate his efforts. the product looks good.did not test it. leave additional feedback after testing it. thanks…

  10. M***a


  11. C***s

    Slow, very very slow

  12. B***t


  13. K***k

    Did not check performance, but sent quickly, packed well

  14. G***z

    Product not acted, store oddał pieniadze

  15. Customer

    Everything works and corresponds to the description, but the delivery is very long.

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