Features: 1. Turn any hollow surface into a speaker: These bone conduction speakers are compact and versatile, enabling a unique audio experience in various environments. Transform everyday objects into functional speakers with ease. 2. Varied sound output based on surface material: Utilizing bone conduction technology, this speaker delivers a customizable audio experience. Placing it on different surfaces—such as glass, wood, plastic containers, photo frames, or metal—can produce distinct sound characteristics. 3. Portable design: Lightweight and compact, this speaker is easy to carry and use on the go. 4. Powerful audio performance: When placed on suitable resonant surfaces, the speaker can produce sound up to 115 decibels, offering enhanced volume and sound customization. Thin, rigid materials like plastic containers or buckets are recommended for optimal results. 5. Multi-purpose functionality: Use the speaker for listening to music, podcasts, making hands-free calls, participating in conference calls, gaming, or enhancing audio immersion during gameplay. It also includes built-in FM radio functionality for listening to radio stations and audio content. Specifications: - Battery Capacity: 400mAh - Functions: Bone Conduction Speaker, FM Radio - Wireless Version: 5.0, supporting A2DP, HFP - Stereo Audio Support: Yes - Built-in FM Radio: Yes - Bone Conduction Transducer Power: 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 to use FM function outdoors; connect USB cable during use for stable performance - Material: Metal - Color: Silver Package Contents: 1 x Bone Conduction Speaker 1 x Charging Cable Note: The color may vary slightly due to lighting and display settings. Measurement tolerance: +/- 1-3cm.