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 different surfaces into sound sources anytime, anywhere. 2. Sound variation based on surface material: Utilizing bone conduction technology, this speaker delivers a customizable audio experience. Placing it on various surfaces such as glass, wood, plastic containers, photo frames, or headphones can produce distinct sound characteristics. 3. Portable design: Lightweight and compact, this speaker is easy to carry and use on the go. 4. High sound output: When placed on resonant surfaces like thin plastic or hollow objects, the speaker can produce sound up to 115 decibels, offering customizable audio quality. 5. Multi-functional use: Supports music playback, podcasts, hands-free calls, conference calls, gaming audio, and FM radio reception. Built-in FM radio allows for standalone listening without a connected device. Specifications: - Battery Capacity: 400mAh - Functions: Bone Conduction Speaker, FM Radio - Wireless Version: 5.0, supporting A2DP, HFP - Wireless Stereo: Supported - Built-in FM Radio: Yes - Bone Conduction Transducer: 3W - Frequency Range: 120Hz - 16kHz - Built-in High-Sensitivity Microphone: Yes - Battery Type: 400mAh Polymer Battery - Charging Port: USB-C (not compatible with fast charging) - Recommended for outdoor FM use; connect USB cable during FM operation - 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 display differences. Measurement tolerance: +/- 1-3cm.