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This SIM800l module has a set of TTL level serial interface, a set of power supply interface. Besides, there are a set of antenna interface on this module. The chip of SIM800L basic features SIM800H is a complete Quad-band GSM/GPRS solution in a LGA type which can be embedded in the customer Applications: SIM800H support Quad-band 850/900/1800/1900MHz, it can transmit Voice, SMS and data information with low power Consumption: With tiny size of 15.8*17.8*2.4 mm, it can fit into slim and compact demands of customer design. Featuring Bluetooth, FM and Embedded AT, it allows total cost savings and fast time-to-market for customer applications. General features •Quad-band 850/900/1800/1900MHz •GPRS multi-slot class 12/10 •GPRS mobile station class B •Compliant to GSM phase 2/2+ - Class 4 (2 W @ 850/900MHz) - Class 1 (1 W @ 1800/1900MHz) •Bluetooth: Compliant with 3.0+EDR •FM: 76~109MHz worldwide bands with 50 KHz tuning step •Dimensions: 15.8*17.8*2.4mm •Weight: 1.35g •Control via AT commands (3GPP TS 27.007, 27.005 And SIMCOM enhanced AT Commands) •Supply voltage range 3.4 ~ 4.4V •Low power consumption •Operation temperature:-40℃ ~85℃