TTL serial port for serial port, you can link directly to the micro-controller.
Don’t need MAX232.
Power module automatically boots, homing network.
Onboard signal lights all the way.
It flashes slowly when there is a signal, it flashes quickly when there is no signal.
 
Chip: SIM800L; Voltage: 3.7-4.2V; Peak Current: 2A; Supply voltage: 3.8V – 4.2V; Recommended supply voltage: 4V; Interface: UART (max. 2.8V) and AT commands; SIM card socket: microSIM (bottom side); Supported frequencies: Quad Band (850 / 950 / 1800 /1900 MHz)
Power consumption:- sleep mode < 2.0mA; idle mode < 7.0mA; GSM transmission (avg): 350 mA; GSM transmission (peek): 2000mA; Antenna connector: IPX; Status signaling: LED; Working temperature range: -40 do + 85 ° C
Module Size:- Length: 24mm; Width: 26mm; Height: 4mm; Weight: 12gm
Package Includes:- 1 x SIM800L GPRS GSM Module Micro SIM Card Core Board Quad-band TTL Serial Port ( 3.7-4.2V); 1 x Antena
Packaged by:- Sharvi Technologies (OPC) Pvt. Ltd.; Address:- #09, CK Nagar, AECS layout, Hosa Road, Bangalore-560100