Features: 1. Turn any hollow surface into a speaker: These bone conduction speakers are compact and versatile, enabling a unique o experience in various environments. Transform everyday objects into sound sources with ease. 2. Sound varies by surface: Utilizing bone conduction technology, this speaker delivers a customizable o experience. Placing it on different surfaces such as glass, wood, plastic containers, photo frames, or metal can produce distinct sound characteristics. 3. Portable design: Lightweight and compact, this speaker is easy to carry and use on the go. 4. Powerful o output: When paired with suitable resonant objects, the speaker can produce sound up to 115 decibels, offering customizable sound quality. Thin, rigid materials like plastic containers or buckets are recommended for optimal performance. 5. Multi-functional use: Use for listening to music, podcasts, making hands-free calls, participating in conference calls, gaming, or enhancing o experiences. Built-in FM radio allows for additional entertainment options. Specifications: Battery Capacity: 400mAh Functions: Bone Conduction Speaker, FM Radio Wireless Version: 5.0, A2DP, HFP Stereo o Support: Yes Built-in FM Radio: Yes Bone Conduction Transducer: 3W Frequency Range: 120Hz - 16kHz Built-in High-Sensitivity Microphone: Yes Battery Type: 400mAh Polymer Lithium Battery Charging Port: USB-C (does not support fast charging) Note: For best FM reception, use outdoors and ensure the device is connected to a power source via USB cable. 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. Measurement tolerance: +/- 1-3 cm.