Supply voltage range 3.4 ~ 4.4V and Current of 1A or more(the current is very important) It features Bluetooth, FM and Embedded AT(AT commands) Quad-band 850/900/1800/1900MHz Operation temperature:-40 ~85 degree Celsius Applications: SIM800L supports Quad-band 850/900/1800/1900MHz, it can transmit Voice, SMS and data information with low power. Due to its size,It can fit into slim and compact demands of customer design. Package include: 1x SIM800L board 1x Antenna Dispathced with Royal Mail 24H Check Out My Other Items. Click Here !