Product information:
Transmission range: 10 meters
Function: battery display, call function, voice control, support music
Bluetooth protocol: 5.0
Channel: Stereo
How to use: head-mounted

Parameter:
Product Model: ZL B19 Headphones
Bluetooth solution: Bluetooth V5.0, high-definition call surround sound quality
Signal-to-noise ratio: 75dB
Frequency Response: 20Hz-20KHz
Output power: 90mw
Playing time: 6-8 hours
Charging time: 1-2 hours
Communication time: barrier-free 15 meters
Headphone battery capacity: 500mAh

Packing list:

A set of earphones + Android charging cable + Chinese and English instructions*1