Bone conduction speaker, a DIY sound experience, place it on different surfaces such as plastics storage box, glass, wooden desk can provide you various sound effects.Features advanced BT 5.0 chip supporting BT connection and T-W-S-enabled.Quality sound effect, up to 115db powerful sound volume, full bass and loud treble.Built-in 400mAh lithium battery, up to 6 hours playing time after 1 hour fully charged. Mini and compact size, convenient to carry and perfect decoration.Mini and compact size, convenient to carry and perfect decoration.