Bluetooth Technical Specifications: Headscarf Material: Polyester Bluetooth version: 5.2 Bluetooth protocol: AGHSP Bluetooth solution: Lanxun Bluetooth transmission distance: 10m Headphone channel: Stereo 2.0 Music playback time: 8 hours for sound, 10 hours at medium volume Microphone distance: 1m Bluetooth standby time: 72 hours Battery capacity: 150mAh Battery power: 0.55W Speaker impedance: 32 ohms Speaker power: 0.02W Frequency range: 2.4-2.4835GHz Sensitivity: 45dB Transmit power: 6dB Audio output distortion: 0.6% Audio output signal-to-noise ratio: 93dB Charging time: 1-2 hours Input Voltage: DC 5V Input current: 150mah Input power: 0.55W Product Packaging Information Single weight: 70g Size: 26cm*10cm Packaging accessories: Bluetooth headscarf, manual, charging cable, OPP bag