Earphones And Music

Specifications:
1> Bluetooth version: V5.3
2> Frequency: 2.40 GHz to 2.48 GHz
3> Power: ≤ 4 dBm, Level 2
4> Effective range: 10 meters
5> Frequency response: 20Hz-20kHz
6> Bluetooth mode support: A2DP 1.2, AVRCP 1.0, HSP, HSF 1.5
7> Voltage: 3.7 VCC (with built-in 400mAh rechargeable battery)
8> S/N rate: 70 dB
9> Play time: 20 hours, charging time: 2.5 hours, waiting time: 360 hours
10> Charging port: Mini 5-pin USB charging port
11> Working temperature: -4 to+131 ° F (-20 to+55 ° C)