ltem description from the seller
Bluetooth Chip:V5.0
Audio Input:Wired/Wireless
Working Frequency:20-20KHZ
Output Power:35MW
Scope of Operation:Barrier-Free10Rice
Bluetooth Usage Time:20-24H
Charging Time:about4H
Standby Time:about400H
Operating Voltage:3.7VDC
Place of Delivery:Guangdong Pro
Wearing Style:Head-Mounted
With Or without Microphone:with Microphone
Usage Type:Music Headset
Noise Reduction Function:Passive Noise Reduction(Physical Noise Reduction)