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 True Wireless Stereo-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.