Features: Bone conduction speaker, a DIY sound experience, place it on different surfaces such as plastics storage box, , wooden desk can provide you various sound effects. Features advanced BT 5.0 chip supporting BT connection and TWS-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. Used as FM radio allows you to listen to music, have phone conversations or conference calls, and even enjoy an fine sound experience of your playing games, videos or movies. Specifications: Material: aluminum alloy Color: black Qty: 1 pack, 2 pack(optional) BT version: BT5.0 Audio format: MP3, AC3, AAC, WAV... Output power: 3W Frequency response: 20-20kHz SNR: ≥70dB Power-supply: 400mAh lithium batterys, Type-c charge DC5V/0.4A Package size: 70*70*50mm/2.76*2.76*1.97in(1 pack) 145*75*50mm/5.71*2.95*1.97in(2 pack) Package weight: 85g/3oz(1 pack) 190g/6.7oz(2 pack) Packing List: Package1 1*BT speaker 1*Lanyard 1*Suction Cup 1*Adhensive 1*Type-c charge cable Package2: 2*BT speaker 2*Lanyard 2*Suction Cup 2*Adhensive 2*Type-c charge cable