Features: This is a BT resonance speaker (commonly known as bone-conduction speaker), with the function of sound collecting rhythm light. The special resonance horn unit is used to attach the product to any place through reusable water-washed nano glue the surface of an object, making it resonate and produce sounds with different effects. Built in 24 colorful light beads and sound collecting microphones, when playing music or there is sound around the product, the rhythm light will beat with it. With 5.0 BT chip, the compatibility is stronger. Say goodbye to unstable connection interruption, more stable sound quality for you. Customized 3W strong magnetic horn + submersible low-frequency diaphragm, the original sound presents pure sound quality, and the real small size and loud volume. Built in multiple light effects colors can be switched at will, and music can be played simultaneously with BT resonance sound, sound and light synchronization, bring you o-visual synchronization enjoyment, make you happy physically and mentally. Specifications: Material: Metal Power Max:5.4W Battery Capacity:Polymer Li-ion 400mAh BT Ver:V5.0 Transmission Distance: more than 30 Metre Speaker Type:3W Strong magnetic resonance horn LED Type:RGB-LED LED Qty:24pcs Waterproof:Not waterproof Charging Input:Type-C 5V-0.3A Charging Time:2 Hours and 40 Minutes Endurance Time:   About 1 hour(Sound pickup light + BT speaker)   1.5 hours (BT Speaker mode)   more than 3 hours (Pickup light mode) Standby time:BT is not connected Non sound collecting, shuts down automatically in 5 minutes Item Size: 61*61*26mm Item Weight: 48g1.7oz Package Weight: 130g4.6oz Package Size: 14.5*7.4*3.5cm Package List: 1*Rhythm light BT speaker 1*Operating instructions 1*Type-C charging cable