Usage Tips: Features: 1. Turn any hollow object into a speaker: This bone conduction speaker is compact and versatile, delivering an immersive audio experience in various environments. Mount it on compatible surfaces to transform them into resonant sound sources. 2. Unique sound variation by surface: Utilizing bone conduction technology, this speaker produces distinct audio characteristics depending on the surface it’s attached to—such as glass, wood, plastic, or metal. Experiment with different materials for varied acoustic effects. 3. Portable design: Lightweight and compact, it’s easy to carry and use on the go. 4. High-output audio: When paired with suitable resonant objects (e.g., thin-walled plastic containers or buckets), it delivers clear, powerful sound—up to 115 dB SPL. 5. Multi-use functionality: Use it for music playback, podcasts, hands-free calls, voice conferencing, gaming audio, and FM radio reception. Specifications: Battery Capacity: 400 mAh Functions: Bone Conduction Speaker, FM Radio Bluetooth Version: 5.0 (A2DP, HFP) Wireless Stereo Support: Yes Built-in FM Radio: Yes Bone Conduction Transducer Power: 3W Frequency Response: 120 Hz – 16 kHz Built-in Microphone: Yes, high-sensitivity Battery Type: 400 mAh Polymer Battery Charging Port: USB-C (not compatible with fast charging) Note: For optimal FM reception, use outdoors and connect the USB cable during operation. Material: Metal Color: Silver Package Includes: 1 × Bone Conduction Speaker 1 × Charging Cable Note: Colors may vary slightly due to screen settings and lighting conditions. Measurement tolerance: ±1–3 cm.