• 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