The GSM Module/GPRS based on the Simcom Arduino Shield module. The module allows you to obtain SMS, MMS, GPRS and Audio via UART commands by sending AT commands (GSM commands 07.07, 07.05 and simCOM enhanced with COM commands). The module also has 12 GPIOs, 2 PWMs and an ADC from the SIM900 module (they are all 2V8 logic) present on board.

A Zener Diode with 6.8V and 2W.

This Rectifier Diode (1N4002) contains a diffuse junction, high current capacity, low voltage, voltage overload at 30A, low reverse leakage current and has a lead-free coating, compatible with to RoHS.

Zener Diode with 12V and 5W

This Power Diode (1N4003) contains a diffuse junction, high current capacity, low voltage, voltage overload at 30A, low reverse leakage current and has a lead-free coating, compatible with to RoHS.

A Rectifier Diode 1N5401.

A Rectifier Diode 1N5402.