Low voltage, low power consumption, power amplifier IC, high quality, low distortion Built-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% volume Comes with an audio cable at the bottom of the speaker. Equipped with a USB charging cable Unique design - retractable speakers. Small and light, hang hole design, easy to carry Suitable for MP3, MP4, MP5, cell phones, computers and other devices with a 3.5 mm audio jack Color: black Material: Silicone + metal Size: 5.2 x 3.8 cm Package Contents: 1 x Loud Speaker 1 x USB Cable Only the above package content, other products are not included Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.