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SIM900A GSM GPRS Module with RS232 Interface and SMA Antenna E-957 Dual-band 900/1800 MHz GPRS multi-slot class 10/8 GPRS mobile station class B Meet GSM 2/2 standards Class 4 (2 W @ 900 MHz) Class 1 (1 W @ 1800MHz) Size: 24 x 24 x 3 mm Controlled by AT commands (GSM 07.07, 07.05 and SIMCOM enhanced AT command set) SIM application toolkit Supply voltage range: 3.2-4.8V Low power consumption: 1.5mA (sleep mode) Operating temperature range: -40 ° C to +85 ° C.