SIM900 Quad-Band GPRS GSM Shield Development Board Module Fit for ArduinoAvailable Worldwide

Specification: Item Type:GPRS/GSM Shield Quad-Band: 850/900/1800/1900 MHz - for GSM Networks in All Countries Worldwide. GPRS Multi-Slot Level: 10/8 GPRS Mobile Station: Class B GSM Compliant: 2/2 + Level 4 (2 W @ 850/900 MHz) Level 1 (1 W @ 1800 / 1900MHz) Control Via AT Commands - Standard Commands: GSM 07.07 and 07.05 Enhanced Command: SIMCOM AT Command. Short Message Service - Allows You to Send Small Amounts Of Data Over The Network (ASCII Or Raw Hex). Embedded TCP / UDP Stack - Allows You to Upload Data to a Web Server. Support For RTC. Optional Serial Port. Speaker And Headphone Jack Low Power Consumption - 1.5mA (Sleep Mode) Temperature Range -: -40? To +85? Package List: 1 x Module 1 x Antenna Note: The computer can debug USB--TTL. The power supply of this module is: 5V-26V. If it is 5V power supply, it must be above 2A. It is recommended that 9V power supply. After plugging in the Arduino board, the power supply must be able to supply 2A. The reason is that the GPRS Shield startup current and the maximum peak current required to work up to 2A, but the USB port can not provide such a large current, so the external power supply equipment must be provided. Another power supply port header leads to a 3.7--4.5V power supply for lithium battery power.