Low voltage, low power consumption, power amplifier IC, quality, low distortionBuilt-in 180mAh battery, no external power supply required, offers one and a half hours of playtime at maximum volume or around 2 hours at 50% volumeComes with an audio cable at the bottom of the speaker. Equipped with a USB charging cableUnique design - retractable speakers. Small and light, hang hole design, easy to carrySuitable for , MP3, MP4, MP5, cell phones, computers and other devices with a 3.5 mm audio jackColour:blackMaterial:Silicone + metalSize:5.2 x 3.8cmPackage Contents:1 * Loud Speaker1 * USB CableOnly the above package content, other products are not included.Note: Light 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.