Usage Tips: Features: 1. Turn any hollow core into a speaker: These bone conduction speakers are compact and versatile, allowing you to experience sound in a unique way in any environment. Use them with various hollow objects to create audio output. 2. Different sounds with different surfaces: Utilizing bone conduction technology, this speaker delivers a customizable audio experience. Sound characteristics change when attached to different materials such as glass, wood, plastic containers, photo frames, or metal surfaces, offering varied acoustic effects. 3. Portability: The device is small and lightweight, making it easy to carry. 4. Compact and powerful performance: When paired with suitable resonant objects, the speaker can produce strong sound output up to 115 decibels, with adjustable sound quality. Thin-walled objects like plastic containers or buckets are recommended for optimal results. 5. Multi-functional use: Use the bone conduction speaker for listening to music, podcasts, making hands-free calls, participating in conference calls, gaming, or enhancing audio immersion during gameplay. The built-in FM radio allows for independent music and podcast listening. 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: 3Watt Frequency Range: 120Hz - 16kHz Built-in High-Sensitivity Microphone Battery: 400mAh Polymer Battery Charging Port: USB-C (does not support fast charging) For optimal FM reception, use outdoors and ensure the USB cable is connected. Material: Metal Color: Silver Package Contents: 1 x Bone Conduction Speaker 1 x Charging Cable Note: The product image may differ slightly in color due to lighting and screen settings. Size measurements may vary by +/- 1-3cm.