[Turn any hollow object into a speaker] The bone conduction speaker is the world's smallest and most versatile, allowing you to enjoy a different yet spectacular sound experience anytime, anywhere. Turn any hollow object into a speaker anytime, anywhere [Different surfaces, different sounds] – something you've never seen before. This speaker uses bone conduction technology to give you a DIY customized sound experience. You can test and enjoy different sounds – almost like playing different musical instruments. Place it on different surfaces, such as glass, guitars, cardboard boxes, plastic storage boxes, picture frames, sports headphones, or even dashboards, to give you a variety of sound effects. [Excellent combination experience] The bone conduction speaker connects via Bluetooth. Two speakers can be automatically paired via Bluetooth, providing true wireless stereo. We highly recommend using two interconnected speakers to enjoy a 2.0 surround sound experience. [Small but powerful speaker] When you find the right object for your bone conduction speaker, it can be incredibly powerful, reaching up to 115 dB, and allows you to customize the sound quality. Thin objects, such as Halloween plastic boxes or buckets, are recommended. [Multifunctional speaker] You can use the bone conduction speaker to listen to music, podcasts, make individual calls or conference calls, play games or movies, and even enjoy the wonderful sound of games. Bone conduction speakers are also used as FM radio, allowing you to listen to music and follow podcasts.