Awei AT7 Bluetooth wireless headphone stereo surround speaker with microphone headset

Upgraded Li-polymer battery
Longer battery life
Micro-SD card are supported
Bluetooth version: 5.4
Bluetooth protocols: a2dp 1.3.2\avctp 1.4\avdtp 1.3\ avrcp 1.6.2\ hfp 1.8 \spp 1.2\rfcomm 1.1\pnp 1.3\ hid 1.1.1\sdp core5.3\l2cap core 5.3
Channel system: stereo
Battery capacity: 600mAh
Charging time 2.5h
Play time ≈70h
Call time ≈40h
Horn diameter: 40mm
Horn impedance: 32Ω
Horn sensitivity: 121±3dB
Best transmission distance: <1m
Maximum transmission distance: 10m
Bluetooth operating frequency: 2.402GHz~2.480GHz
Wearing method: head-mounted
Charging interface: Type-C
User manual: Chinese and English
Accessories: USB charging cable, user manual