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. 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 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 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. 5. Multifunctional speakers: You can use bone conduction speakers to listen to music, podcasts, stand-alone phone conversations or conference calls, play games or , 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. : Capacity: 400mAh Function: Bone Conduction Speaker, FM Wireless ver: 5.0, A2DP, HFP Wireless Stereo supported FM radio build-in Bone Conduction transducer: 3Watt Frequency range: 120Hz-16kHz High sensitive microphone build-in Battery: 400mAh Polymer Battery Charging port yo=C charging port (not compatible fast charge) Suggest to use FM function outdoor, plug in USB cable as well. Material: Metal colour: silver Package Contents: 1 x Bone Conduction Speaker 1 x Charging cable Only the above package content, other products are not included. 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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!