Brand NO Model No Quantity 1 Color Black + blue Material PCB + aluminum alloy Features GSM/GPRS SIM900 module ICOMSAT expansion board compatible w/ Arduino Specification MPU: SIM900; Individual working volage and current; 5V / 2A; Must provide DC 9V / 2A power after plug Arduino board for GSM shield power on current and peak current need 2A; Quad-band GSM / GPRS: 850 / 900 / 1800 / 1900MHz; GPRST multi-slot class 10/8; GPRS mobile station class B Compliant to GSM phase 2/2+Class 4 (2 W @850/ 900 MHz); Supports UART port antenna connector; Built-in TCP / IP protocol; Supports Multi-IP connecting; Class 1 (1 W @ 1800/1900MHz); Low power consumption: 1.5mA(sleep mode); Operation temperature: -40~+85'C; The GPRS (General Packet Radio Service) Shield is a new nonvoice value added service that delivers GSM/GPRS 850/900/1800/1900MHz performance for voice SMS Data and Fax in a small form factor and with low power consumption. It is controlled via AT commands (GSM 07.07 07.05 and SIMCOM enhanced AT Commands) and fully compatible with Iteaduino/Arduino and Mega. Application A product for arduino that works with official Arduino boards. English Manual/Spec Yes; Download address: www.veskys.com/Instrucuction Manual/0113052620384021.zip Packing List 1 x Expansion board 1 x Antenna 1 x Extending cable (17cm)