Features: 1. Turn any hollow core into a speaker: These bone conduction speakers are compact and versatile, enabling a unique o experience in various environments. Transform any hollow surface into a speaker anytime, anywhere. 2. Different sounds with different surfaces: Utilizing bone conduction technology, this speaker delivers a customizable o experience. Experiment with various surfaces such as glasses, guitars, paper boxes, plastic containers, photo frames, headphones, or dashboards to enjoy a range of sound effects. 3. Portability: Designed to be small and lightweight, this speaker is easy to carry and use on the go. 4. Small but powerful: When placed on suitable surfaces, the speaker can deliver strong o output up to 115 decibels, allowing for personalized sound quality. Thin materials like plastic boxes or buckets are recommended for optimal performance. 5. Multifunctional use: Use the bone conduction speaker for listening to music, podcasts, making hands-free phone calls or conference calls, playing games, watching movies, or enhancing gaming o. The built-in FM radio function allows for additional entertainment options. Specifications: Capacity: 400mAh Functions: Bone Conduction Speaker, FM Radio Wireless Version: 5.0, A2DP, HFP Wireless Stereo Supported: Yes FM Radio: Built-in Bone Conduction Driver: 3Watt Frequency Range: 120Hz - 16kHz Built-in High-Sensitivity Microphone: Yes Battery: 400mAh Polymer Battery Charging Port: USB-C (not compatible with fast charging) Note: For optimal FM performance, use outdoors and connect the USB cable. Material: Metal Color: Black / Red / Silver Package Contents: 1 x Bone Conduction Speaker 1 x Charging Cable Note: Only the items listed above are included. Other products are not included.