Celebrate A19 Neckband Bluetooth

Drive unit: 10mm s/n : 90db best work range: ≤5m frequency response: 20-20khz working frequency: 2402mhz~2480mhz charging time: 2h talk time: about 9h(70% volume) standby time: about 250h 1.Ultra long standby time about 250h, large capacity 110mah lithium battery, 2 hours fast charging,9h call and music time. 2.Fingertip touch, careful design, covenient operation, easy to complete music, power on, power off, phone calls and other functions. 3.Strong compatibility support connect 2 mobile phones.More and more covenient.