Features: 1. Turn any hollow surface into a speaker: These bone conduction speakers are compact and versatile, delivering sound through vibration on solid surfaces. Experience immersive audio in various environments. 2. Sound variation with different surfaces: Utilize bone conduction technology to explore unique audio characteristics. Place the device on surfaces such as eyeglass frames, wooden boxes, plastic containers, photo frames, or dashboards to hear distinct acoustic effects. 3. Portable design: Lightweight and compact for easy carrying. 4. High-output performance: When placed on resonant surfaces like thin plastic or metal objects, the speaker can produce loud, clear sound—up to 115 dB. Optimal results are achieved with rigid, lightweight materials. 5. Multi-use functionality: Use for music playback, podcasts, hands-free calls, gaming, video watching, and FM radio listening. Built-in FM radio supports outdoor use. Specifications: Battery capacity: 400 mAh Functions: Bone conduction speaker, FM radio Bluetooth version: 5.0 (supports A2DP, HFP) Wireless stereo: Yes Built-in FM radio: Yes Transducer power: 3 W Frequency response: 120 Hz – 16 kHz Built-in microphone: Yes Battery type: 400 mAh polymer battery Charging port: USB-C (not compatible with fast charging) Recommended for FM use outdoors; connect USB cable during FM operation. Material: Metal Color: Silver Package includes: 1 x Bone Conduction Speaker 1 x Charging cable Note: Color may vary slightly due to screen settings and lighting. Dimensions may vary by ±1–3 cm.