Hook your Arduino up to GSM/GPRS cell phone network with GPRS shield! You can use your Arduino to dial a phone number or send a text to your friend via easy to use AT commands now. This new version features a quad-band low power consumption GSM/GPRS module SIM900 as well as a compact PCB antenna. Meanwhile improvements on interfaces and basic circuit have been taken to make it more concise and reliable. Check out the improvement details of V2.0 Features 1. Compatible with standard Arduino and Arduino Mega 2. Selectable interface between hardware serial port and software serial port 3. Quad band support: 850/900/1800/1900MHz 4. Support TCP/UDP protocols 5. Full control via AT commands set: Standard - GSM 07.07 & 07.05 and Enhanced - SIMCOM AT Commands 6. 2-in-1 headset jack 7. Convenient external SIM card holder 8. Low power consumption: 1.5mA (sleep mode) 9. 3V CR1220 Battery Holder Connector