Parameter Description Support various smartphones and tablets of and Android systems. Speaker power: 10W Signal-to-noise ratio: ≥60dB Frequency response range: 40~ 20KHZ Audio source interface: 3.5mm stereo headphone plug Battery: Built-in 1500MAH lithium battery in the host, 500MAH each in dual Bluetooth microphones Charging time: 1~3 hours Playing time: 2-4 hours at medium volume after full charge Power adapter requirements: Output voltage: 5V Current 1A/2A Function: Play MP3 format music in U disk/TF card, connect mobile phone or tablet karaoke via audio cable (not included) or Bluetooth, use as microphone for speech Material: Plastic colour: Black Package Contents: 1 x Speaker 2 x Microphone Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Wireless Bluetooth speaker Dual microphone KTV Karaoke machine with speaker