Arduino UNO R3 Official Genuine Version + USB Cable Support low power consumption mode:

Support low power consumption mode: 100mA @ 7V-GSM mode

There are so many GPRS/GSM modules on the market which need to add 5V regulator and level converter circuit

Power to the output current of 800 ma

SIMR SIM900A RXD

Antenna interface circuit(SMA bend female port)

Arduino UNO R3 Official Genuine Version + USB Cable Support low power consumption mode:Arduino Uno is a microcontroller board based on the ATmega328P. It has 14 digital input output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53 R0), a USB connection, a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with a AC to DC adapter or battery to get started.