Our speakers adopts .1 technology for easy pairing, and it supports USB flash drive, and music playing, hands-free calling, audio input function to provide you rich playing experience. Built-in rechargeable lithium battery enables convenient charging by USB cable. Using this music box to deliver clear and crisp super bass sound, it’s an outdoor and indoor music player for you and your family, friends to enjoy music Feature - 4.1 version. Compatible with smartphones like , , , , , ,Tablets, , MP3, MP4, PC, Notebook, Laptop and any other audio devices with . - Metal net construction. Sturdy and structure, smooth and comfortable touch, elegant and stylish appearance. Anti-slip mat design for great absorbtion and resistance. - Luxurious surround stereo bass sound. High fidelity speaker ensures 3d surround stereo and super bass sound effects. - Support reading the files of U disk and to play the music directly. Supports AUX audio input, easy access to external audio source to enjoy a steady stream of music. Specifications - Color: Silver - Material: Metal - Size: 7.00X7.00X5.00cm/2.75X2.75X1.97in - Version: .1 - Support: card, U disk, USB - Frequency response range: 100HZ-20KHZ - Signal to noise ratio: greater than 75db - Playback time: Up to 4-6 hours - Wireless Range: Up to feet (10 meters in open air) - Functions: Microphone, MP3 function, Turn on/ off / Hands free call, Mode change, Last song/ Volume Up, Next song/ Volume Down Package list: 1 x Speaker