GSM-GPRS Arduino SIM900 ( you can test it before buy ) Open-end Timing Belt Reading and writing distance: 1

Reading and writing distance: 1 to 2 cm

Frame rate: 25FPS

support for 64-bit systems

Opto Endstop will immediately output the digital control

It allows you to add mass storage and data logging to your project

GSM-GPRS Arduino SIM900 ( you can test it before buy ) Open-end Timing Belt Reading and writing distance: 1GSM GPRS MODULE is an ultra compact and reliable wireless module. It is based on SIM900 4 Frequency GPRS module. The GSM GPRS Shield is configured and controlled via its UART using simple AT commands. Module have two set power supply interface VCC5 5V power supply, VCC4 interface, 3. 5 4. 5V power supply, optional power on self starting (default) and control start. The MODULE allows you to achieve this via any of the three methods: Short Message