The SIM800L modem has a set of TTL level serial interface, a power interface and also an antenna interface
It is a quad band solution with the SIM800L chip
Quad band 850/900/1800 / 1900MHz
GPRS multi-slot class 12/10
Compatible with GSM phase 2/2 +
Class 4 (2 W @ 850 / 900MHz)
Class 1 (1 W @ 1800 / 1900MHz)
Bluetooth: 3.0 + EDR compatible
Dimensions: 15.8 * 17.8 * 2.4mm
Weight: 1.35 g