1. Support network: quad-band network
2. Operating voltage: 3.7-4.2V (current peak 1A, please do a good job)
3. Serial port is TTL serial port, can be directly linked with the microcontroller
4. Module power-on automatic boot, automatic network search
5. Board all the way signal indicator (signal slow flash, no signal fast flash)
6. Full machine chip processing, reflow soldering, stable performance, power supply can be directly powered by lithium batteries
7. Weight: about 5.4 g
8. Module size: about 2.5 x 2.3 cm