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

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