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Comfortable Wireless Music - Bluetooth Sleeping Headphone Headband best digital scale - There might be aBluetooth technical parameters: Bluetooth version: 5. 0 Bluetooth transmission distance: 10M Music playing time: Maximum sound 7h, medium volume 10 hours Microphone distance: 1m Bluetooth standby time: 72h Battery capacity: 150mA h Battery power: 0. 55w Horn impedance: 32 ohm Horn power: 0. 02w Frequency range: 2. 4 2. 4835ghz Sensitivity: 45dB Transmitting power: 6dB Audio output distortion: 0. 6% Audio output SNR: 93dB Charging time: 1 2 hours