Celebrat A19 Bluetooth Wireless Neckband Sport Earphones-Black

Drive unit: 10 mm Frequency response: 10-20 kHz Working frequency: 2402MHz ~ 2480MHz Charging time: 2h Call time: about 7 hours (90% volume) Standby time: about 250 hours Ultra long standby time about 250 hours, large capacity 110mAh lithium battery, 2-hour fast charging Finger touch, delicate design, compatible operation, easy to complete music, play, pause, phone calls and other functions. Strong compatibility support for connecting mobile phones. More and more convenient