1. Earmuff 2. Back/ front ABS cavity 3. Volume +/ next track 4. Turn on/ turn off/ pick
up/ hang up/ reject/ play/ pause 5. Volume -/ previous track 6. LED (red/blue) 7. USB
port 8. Battery 9. TPE wire 10. Slide fastener
Specifications：
Speaker size：10mm
Frequency domain: 20～20KHz
Impedance：16Ω
Sensitivity：103±3dB
Length：600mm±20mm
BT version：5.0
BT chip：BK3266
Transmission distance：approximately 10m
Battery：Polymer lithium battery 3.7V/73mAh
Charging time： approximately 1.5 hour
Play/call time: approximately 8 hours
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