Features: 1. Turn any hollow core into a speaker: These bone conduction speakers are compact and versatile, enabling a unique sound experience in various environments. Use them to transform everyday objects into functional speakers. 2. Different sounds with different surfaces: Utilizing bone conduction technology, this speaker delivers a customizable audio experience. Experiment by placing it on various surfaces such as glass, wood, plastic containers, photo frames, or metal objects to achieve distinct sound effects. 3. Portability: Lightweight and compact design makes it easy to carry and use anywhere. 4. Small but powerful: When placed on suitable resonant surfaces like thin plastic or hollow objects, the speaker can produce strong sound output up to 115 decibels, allowing for enhanced sound customization. 5. Multifunctional use: Supports music playback, podcasts, hands-free phone calls, conference calls, gaming audio, and FM radio reception. Built-in FM radio allows direct access to broadcasts. Specifications: Capacity: 400mAh Function: Bone Conduction Speaker, FM Radio Wireless Version: 5.0, A2DP, HFP Supports Wireless Stereo Audio Built-in FM Radio Bone Conduction Transducer: 3W Frequency Range: 120Hz - 16kHz Built-in High-Sensitivity Microphone Battery: 400mAh Polymer Battery Charging Port: USB-C (does not support fast charging) Recommended to use FM function outdoors; connect USB cable during outdoor use. Material: Metal Color: Silver Package Contents: 1 x Bone Conduction Speaker 1 x Charging Cable Note: Light reflection and display differences may cause slight variations between the product color in images and actual color. Measurement tolerance: +/- 1-3 cm.