1. Quad-Band 850/900/1800/1900 MHz - would work on GSM networks in all countries across the world. 2. GPRS multi-slot /8; GPRS mobile station class B; Compliant to GSM phase 2/2+; Class 4 (2 W @ 850/900 MHz);Class 1 (1 W @ 1800/1900MHz) 3. Control via AT commands - Standard Commands: GSM 07.07 & 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 +85 Due to different batches, there may be differences in product appearance and printed text, which not affect use. Colour:As Shown Material:PCB Package Contents: 2 * Development Board 2 * 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.