Xo BS21 Sports Bluetooth Headset Black

■Bluetooth Solution: BK3266■Bluetooth version：Bluetooth V5.0■Speaker power：Rating 3-5mW■Frequency response：50Hz～20KHz■Speaker unit：Speaker Φ14mm@32ohm■Microphone: MEMS, condenser microphone, -42dB+-2■Built-in battery: Li-ion battery-3.7V,120mAh■Standby time: about 44H■Music time: about 7.2 hours (80% volume)■Talk time: about 7.2 hours (80% volume)■Charging input standard: DC5V-500mA Micro USB■Charging time: about 1.5 hours