Description:
The faster version of the current version of HM-19, V103, supports the following features

1. Transparent transmission mode, transparent transmission + remote control dual working mode
2. The main mode supports two working modes: automatic working and manual working.
3. Ultra high transmission speed (BLE up to 8KB / S)
4. Rich AT commands, support local serial AT commands and remote AT commands
5. Large MTU 253Bytes
6. 6. Support firmware upgrade
7. 7. Support 4.2 and 5.0, default 2M bandwidth connection, compatible with 1M bandwidth