Built in Bluetooth 5.1 chip for more stable transmission, with a straight-line distance of about 10m, compatible with most Bluetooth devices on the market. Woven lanyard design, can be easily hung on a bicycle or backpack, and carried with you Amazing high-resolution dazzling LED lighting effects, combined with music and lighting, make life more enjoyable Equipped with a 4400 milliampere high capacity polymer lithium battery, it can continuously play for 18 hours at full charge 20W real high-power, bringing a brand new HIFI level sound effect, immersive and unique auditory feast. Shocking dual speakers, 9D surround sound effect Directional sound transmission technology greatly reduces environmental noise and allows for excellent sound quality even outdoors Colour:black Material:plastic Package Contents: 1 x speaker 1 x data cable 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.