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 everyday objects into functional speakers with ease. 2. Sound variation based on surface material: Utilizing bone conduction technology, this speaker delivers a customizable o experience. Sound characteristics change when attached to different surfaces such as glass, wood, plastic containers, photo frames, or headphones, 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 sound output: When paired with suitable resonant objects, the speaker can produce sound up to 115 decibels, allowing for enhanced o customization. Thin, hollow materials like plastic containers or buckets are recommended for optimal performance. 5. Multi-purpose functionality: Supports music playback, podcast listening, hands-free phone calls, conference calls, gaming o, and FM radio reception. Built-in FM radio allows direct access to radio stations. Specifications: Battery Capacity: 400mAh Functions: Bone Conduction Speaker, FM Radio Wireless Version: 5.0, A2DP, HFP Stereo o Support: Yes Built-in FM Radio: Yes Bone Conduction Transducer: 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. 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 +/- 1-3 cm.