Features: 1. Turn any hollow surface into a speaker: These bone conduction speakers are compact and versatile, enabling a unique o experience in various environments. Transform different surfaces into functional speakers with ease. 2. Sound varies by surface: Utilizing bone conduction technology, this speaker delivers a customizable o experience. Experiment with various materials such as glass, wood, plastic containers, photo frames, or headphones to achieve different acoustic effects. 3. Portable design: Lightweight and compact, this speaker is easy to carry and use on the go. 4. Powerful o output: When attached to suitable surfaces, the speaker can produce sound up to 115 decibels, offering enhanced o customization. Best performance is achieved with thin, resonant materials. 5. Multi-use functionality: Use for listening to music, podcasts, making hands-free calls, participating in conference calls, or enhancing gaming o. Built-in FM radio allows for wireless music and podcast playback. Specifications: - Battery Capacity: 400mAh - Functions: Bone Conduction Speaker, FM Radio - Wireless Version: 5.0, supporting A2DP, HFP - Stereo o Support: Yes - Built-in FM Radio: Yes - Transducer Output: 3W - Frequency Range: 120Hz - 16kHz - Built-in High-Sensitivity Microphone: Yes - Battery Type: 400mAh Polymer Lithium Battery - Charging Port: USB-C (does not support fast charging) - Recommended for outdoor FM use; connect USB cable for optimal performance - Material: Metal - Color: Silver Package Contents: 1 x Bone Conduction Speaker 1 x Charging Cable Note: The actual product color may vary slightly due to lighting and screen display differences. Size measurements may have a tolerance of +/- 1-3cm.