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 sound sources with ease. 2. Varied audio output on different surfaces: Utilizing bone conduction technology, this speaker delivers a customizable audio experience. Sound quality varies when attached to different materials such as glass, wood, plastic containers, photo frames, or metal surfaces, offering a range of acoustic effects. 3. Portable design: Lightweight and compact, this speaker is easy to carry and use on the go. 4. High-performance audio: When placed on resonant surfaces like thin plastic or hollow containers, the speaker can produce strong sound output up to 115 decibels, allowing for enhanced sound customization. 5. Multi-use functionality: Suitable for listening to music, making hands-free calls, participating in conference calls, playing audio from games, or enjoying FM radio content. Supports wireless audio streaming and built-in FM radio reception. Specifications: Battery Capacity: 400mAh Functions: Bone Conduction Speaker, FM Radio Wireless Version: 5.0, A2DP, HFP Stereo Audio Support: Yes Built-in FM Radio: Yes Transducer Output: 3W Frequency Range: 120Hz - 16kHz Microphone: Built-in, high sensitivity Battery Type: 400mAh Polymer Lithium Battery Charging Port: USB-C (does not support fast charging) Recommendation: Use FM function outdoors and connect USB cable for stable performance Material: Metal Color: Black Package Contents: 1 x Bone Conduction Speaker 1 x Charging Cable Note: The product color may slightly vary due to lighting and screen display differences. Measurement tolerance: +/- 1-3 cm.