Product name: Resonance bone conduction sound Product size: 4x4x2.6cm or 1.57x1.57x1.02 inches Main control chip: Bluetooth 5.0 supports real stereo sound Efficiency chip: 20HZ-20KZ full range output Acoustic channels: Dual acoustic channels, 2 independent bone conduction transducers Output power: 3W audio output Audio decoding: MP3 or AC3 or AAC or WAV and other support Bone conduction transducer: Built-in enhanced magnetic core and high performance coil Microphone: omnidirectional microphone, can talk FM radio: Built-in FM enhanced IC, conventional indoor reception station to more than 10 Charging interface: TYPE-C interface, 5V0.4A charging current Built-in battery: 400mah capacity Standby time: not less than 240 hours If used all the time, play at 80 percent volume for 2-3 hours, and the maximum volume can play for 1-1.5 hours A single installation can connect two speakers to form a left and right stereo Wireless connectivity: Using the latest Bluetooth technology, our conductive-tuned speakers provide seamless connectivity. Enjoy true stereo sound without the hassle of wires, allowing you to easily pair your devices for a worry-free listening experience. Dual Channel design: Our conduction tuned speakers feature a unique dual channel design with two independent conduction transducers to provide you with an unparalleled audio experience. Long battery life: The built-in omnidirectional microphone lets you answer calls effortlessly without missing a beat. In addition, with more than 4 hours of play time, you can rely on our command tuner speakers to always be ready for inspiration strikes. There is no need to worry about running out of battery during listening. Portability: Our conductive tuned speakers are designed for ultimate portability. Take it with you wherever you go, whether in the shower, at home, or outdoors. Its lightweight and compact design makes it the perfect companion for your busy lifestyle. DIY Sound experience: Our conductive tuned speakers do more than just deliver clear sound. It also provides a unique sound experience that allows you to place it on different surfaces, such as plastic storage bins, glass, or wooden tables. Try a variety of sound effects and enjoy the latest audio technology without clogging your ears. Immerse yourself in a truly personalized listening experience. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.