The default is not to weld the needle, leaving more room for expansion for customers

Module model: sim800l (new module, performance over sim900 / M590)
Working voltage: 3.7 ~ 4.2V (peak current 1a, please handle it well)
Support network: China Mobile, China Unicom and global four band network
Module size: 2.5cmx2.3cm
The serial port is TTL serial port, which can be directly linked with MCU. No MAX232 required
The module is powered on automatically and the network is searched automatically
On board one way signal indicator (slow flashing with signal, fast flashing without signal)
The size of the global small, there is no module smaller than this GSM module
All machine chip processing, reflow soldering, stable performance, factory direct sales