Features: 1. Compatible with turning any hollow core into a speaker: These bone conduction speakers are the smallest and most versatile bone conduction speakers in the world, allowing you to get a different but amazing sound experience in any environment. Compatible with turning any empty space into a speaker anytime, anywhere. 2. Different sounds with different surfaces: This speaker uses bone conduction technology Compatible with giving you a DIY sound experience. You can test and enjoy different sounds - almost like using different instruments. Placing it on different surfaces such as glass, guitars, kraft cardboard boxes, plastic Compatible with storage boxes, photo frames, sports headsets or even dashboards can give you a variety of sound effects. 3. Portability: This product is small in size and light in weight, which is very convenient to carry around. 4. Small but powerful speakers: If you find the right Compatible with target Compatible with your bone conduction horn, the speakers can be very powerful, reaching 115 decibels and allowing you to customize the sound quality. It is recommended to place thin Compatible with targets such as Halloween plastic boxes or buckets. 5. Multifunctional speakers: You can use bone conduction speakers Compatible with listening to music, podcasts, making standalone phone calls or conference calls, playing games and even enjoying game audio. Bone conduction speakers also function as an FM radio, allowing you to listen to music and follow podcasts. : Capacity: 400mAh Function: Bone conduction speaker, wireless FM Version: 5.0, A2DP, HFP wireless stereo Supports FM radio Built-in bone conduction transducer: 3Watt Frequency range: 120Hz-16kHz High sensitivity microphone Built-in battery: 400mAh polymer battery Charging port yo=C Charging port (not compatible with fast charging) It is recommended to use the FM function outdoors, also connect the USB cable. Material: Metal Color: Silver Compatible with package contents: 1 x Bone Conduction Speaker 1 x Charging Cable Only the above Compatible with package contents, other products are not included. Note: Light reflection and different displays may cause the color of the product in the picture to differ slightly from the real item. The allowed measurement error is +/- 1-3 cm.