Bluetooth Specification :v2.1+EDR class 2
Output power RMS: 3W*2
Speaker impedance:4Ω*2
Frequency response: 120Hz-13KHz
Speaker size: ￠45MM*2
charging: DC 5V    Voltage: DC 3.7V:
battery inside: 3.7V    1500mA       playing time :≥   5H (volume 50%)
transmission range:≤  10M(depends on the environmental factor and connected device)