1. Quad-Band 850 or 900 or 1800 or 1900 MHz - would work on GSM networks in all countries across the world. 2. GPRS multi-slot or 8 GPRS mobile station class B Compliant to GSM phase 2 or 2and Class 4 (2 W 850 or 900 MHz) Class 1 (1 W 1800 or 1900MHz) 3. Control via AT commands - Standard Commands: GSM 07.07 and 07.05 | Enhanced Commands: SIMCOM AT Commands. 4. Short Message Service - so that you can send small amounts of data over (ASCII or raw hexadecimal). 5. Embedded UDP stack - allows you to upload data to a web server. Low power consumption:1.5mA(sleep mode) Industrial Temperature Range:-40 to and85 Due to different batches, there may be differences in product appearance and printed text, which will not affect use. Colour:As Shown Material:PCB Package Contents: 2 x Development Board 2 x Antenna Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.