Main Changelog from V2 to V3 :
1. Replaced with new MCU and new program
2. Improve the slow connection problem of Android
3. Faster and more stable connection

Specification:

Input voltage : 3.3-5v
Transmission distance : 30M
Bluetooth Protocol: bluetooth Specification V4.0 BLE
Frequency Range: 2400 MHZ – 2483.5MHZ (2.4G ISM Band) Baud Rate: 115200
MCU : New MCU
Size: 13mmX16mm Weight: 0.4g