Product model :B3
Bluetooth chipset : QCC3040 
Bluetooth version : 5.2 + EDR/BLE 
Bluetooth protocol : HSP1.2 HFP1.7.1 / A2DP1. 3.1 / AVRCP1.6 SPP1.2 / DI1.3 / AVCTP1.4 
Channel system : monophonic sound 
Noise reduction method : CVC8.0 noise reduction 
Operating voltage : 3.3-4.2V 
Working current : 4-8mA 
Charging voltage : DC 5V 
Charging current is 30mA 
Battery capacity: 30mA 
Charging time :about 1.5h 
Frequency range : 2.402 ~ 2.480GHz 
Distance : >10 m