Best Portable Compatible Bone Conduction Speaker Stereo Sound Bluetooth Speaker(Silver) Features: 1. Turn any hollow core into a speaker: This bone conduction speakers are the smallest and most versatile bone conduction speakers in the world, allowing you to have a different but still great sound experience in any environment. Turn any void into a speaker anytime, anywhere._x000D_ 2. Different sounds with different surfaces: This speaker uses bone conduction technology to give you a diy sound experience. You can test and enjoy different sounds - almost like using different instruments. Putting it on different surfaces like glasses, guitars, kraft paper boxes, plastic storage boxes, photo frames, sports headphones or even dashboards can give you a variety of sound effects._x000D_ 3. Portability: This product is small in size and light in weight, which is very convenient to carry around._x000D_ 4. Small but powerful speakers: If you find the right object for your bone conduction horn, speakers can be very powerful, reaching 115 decibels and allowing you to customize the sound quality. It is recommended to place thin objects such as halloween plastic boxes or buckets._x000D_ 5. Multifunctional speakers: You can use bone conduction speakers to listen to music, podcasts, stand-alone phone conversations or conference calls, play games or movies, and even enjoy the experience of game sound. Bone conduction speakers also function as fm radios, allowing you to listen to music and follow podcasts._x000D_ _x000D_ Specifications:_x000D_ Capacity: 400mAh_x000D_ Function: Bone Conduction Speaker, FM_x000D_ Wireless ver: 5.0, A2DP, HFP_x000D_ Wireless Stereo supported_x000D_ FM radio build-in_x000D_ Bone Conduction transducer: 3Watt_x000D_ Frequency range: 120Hz-16kHz_x000D_ High sensitive microphone build-in_x000D_ Battery: 400mAh Polymer Battery_x000D_ Charging port yo=C charging port (not compatible fast charge)_x000D_ Suggest to use FM function outdoor, plug in USB cable as well._x000D_ Material: Metal_x000D_ colour: silver_x000D_ _x000D_ Package Contents:_x000D_ 1 x Bone Conduction Speaker_x000D_ 1 x Charging cable_x000D_ _x000D_ Only the above package content, other products are not included._x000D_ Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_