On offer is a VERY RARE STAR TREK BEYOND Circa 2016 BT-9901 Bluetooth Wireless Headset Headphones + Original Box & Manual .shelfwear to the box.1. Power consumption: ≤ 0.18W2. Working voltage: DC3.7V3. Charge voltage: DC5V/300MA/power4. output speaker impedance: 32R*2,0.02W*25. output frequency response range: 20Hz-20KHz6. signal-to-noise ratio: 90dB7. Charging time: about 3 hours8. playback time: TF card for about 7 hours, Bluetooth for about 6 hours.9. Bluetooth version: 2.1+EDR10. audio format: MP3/WAV/WMA11. mic call sensitivity: -32dB
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