Features: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 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 alloyColor: silverQty: 1 pack, 2 pack(optional)BT version: BT5.0Audio format: MP3, AC3, AAC, WAV...Output power: 3WFrequency response: 20-20kHzSNR: equal or greater than 70dBPower-supply: 400mAh lithium batterys, Type-c charge DC5V/0.4APackage 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:Package11*BT speaker1*Lanyard1*Suction Cup1*Adhensive1*Type-c charge cablePackage2:2*BT speaker2*Lanyard2*Suction Cup2*Adhensive2*Type-c charge cable