XO Bluetooth Sports Earphone BS21

■Dual channel system
■ Bluetooth solution BK: 3266
■ Bluetooth version: Bluetooth v5.0
Receiving sensitivity: – 89dbm
■ Bluetooth effective distance: rating 3-5mw
■Frequency response: 50 Hz ~ 20 kHz
■Speaker unit: copper ring full frequency horn Φ 10mm@16ohm
■ Microphone Mic MEMS, capacitance mic, – 42db + – 2,
■Built in battery: lithium battery – 3.7V, 120mAh
■Standby time is about 40H
■Music time: about 8 hours (80% volume)
■ talk time: about 8 hours (80% volume)
■Charging input standard: dc5v-500ma micro USB
■Charging time: about 1.5 hours
■Battery cycle life charge discharge cycle ≥ 300 times