This is a SIM800C TTL Modem with Rechargeble Battery .
Advantages of this Module:
- Small Form Factor
- This has? a battery life of up to hours.
- It has Micro Sim card slot,
- also has a 3.7V Lithium Ion Battery which can be recharged using USB cable.
- It has TTL interface with pins and a power switch.
- Application: GSM / GPRS / SMS