Features: Bone conduction speaker, DIY sound experience, placing it on different surfaces, such as plastic storage boxes, glass, wooden tables can provide you with various sound effects. Using advanced BT 5.0 chip, supports BT connection and True Wirele Stereo. High-quality sound effect, powerful volume up to 115db, full bass and loud treble. Built-in 400mAh lithium battery, the playback time is up to 6 hours after being fully charged for 1 hour. Mini and compact size, easy to carry and perfect for decoration. Used as an FM radio, you can listen to music, have phone conversations or conference calls, and even enjoy a good sound experience while playing games, videos, or movies. Specifications: BT version: BT5.0 Audio format: MP3, AC3, AAC, WAV... Output power: 3W Frequency response: 20-20kHz Signal-to-noise ratio: 70dB Power supply: 400mAh lithium battery, Type-c charging DC5V/0.4A Material: Aluminum alloy Color: black, silver, red (optional) Quantity: 1 pack, 2 pack (optional)