Usage Tips: Features: 1. Turn any hollow core into a speaker: This bone conduction speaker is among the smallest and most versatile in the world, delivering a unique sound experience in various environments. Transform everyday objects into speakers anytime, anywhere. 2. Different sounds with different surfaces: Utilizing bone conduction technology, this speaker offers a customizable o experience. Sound quality varies when placed on different materials such as glass, wood, plastic containers, photo frames, or metal surfaces, allowing you to explore diverse acoustic effects. 3. Portability: Compact and lightweight design makes it easy to carry and use on the go. 4. Small but powerful: When paired with suitable resonant objects, the speaker can produce strong o output up to 115 decibels, with adjustable sound quality. Best performance is achieved on thin, hollow materials. 5. Multi-functional use: Enjoy music, podcasts, phone calls, conference calls, gaming o, and immersive sound effects. Built-in FM radio functionality allows for standalone listening without a connected device. Specifications: Capacity: 400mAh Functions: Bone Conduction Speaker, FM Radio Wireless Version: 5.0, supports A2DP, HFP Stereo: Wireless stereo supported Built-in FM radio Bone Conduction Transducer: 3Watt Frequency Range: 120Hz - 16kHz Built-in high-sensitivity microphone Battery: 400mAh Polymer Battery Charging Port: USB-C (does not support fast charging) Note: For optimal FM reception, use outdoors and connect the USB cable as an antenna. Material: Metal Color: Silver Package Contents: 1 x Bone Conduction Speaker 1 x Charging Cable Note: Light reflection and display settings may cause slight color variations between the product image and actual item. Measurement may vary by +/- 1-3cm.