Specifications: 

Bluetooth version: V2.1+EDR

Bluetooth transmission power: Class2 4dBm

Bluetooth working frequency: 2.4GHz

Charging voltage: DC 5V/500mA

Working voltage: DC 3.7V

Battery capacity: 1200mA

Music playing time: 10H

Talking time: 20H

THD: ≤0.1% (3.7V/1kHz/1.8W)

Signal to noise ratio: ≥65dB

Speaker parameter: 4Ω 3W ф40mm, two speakers

Bluetooth range: 10-20m

Colors: red, blue, green, black, white