Features: Wide range of applications: The Speaker allows you to listen to music, follow podcasts, have individual phone conversations or conference calls, and even enjoy an amazing experience of the sound of your games, videos or films played on your device. DIY Personalised Sound Effects: Bone conduction speaker, a DIY sound experience, place it on different surfaces such as plastics storage box, glass, wooden desk can provide you various sound effects. Powerful volume: It works like a humBird, small but powerful. It delivers a high sound volume Portability: This product is small in size and light in weight, it is very convenient to carry around. Beautiful: This product is made with functional exquisite craftsmanship, and appearance is very stylish Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Size: 3.5*2.5cm Main control chip: BT 5.0 Power chip: 20HZ ~ 20KZ full range output Sound channel: dual-channel, 2 independent bone conduction transducer Output power: 3W audios output Audios decoding: support for MP3 / AC3 / AACs/ WAV and other kinds of Bone conduction transducer: built-in reinforced magnetic-cores and high-performance coils Microphone: Omni-directional microphone, talk, FM function FM radio: built-in FM enhancement IC Charging interface: TYPE C interface. Charging current: 5V 0.4A Built-in battery: lithiums polymers Battery capacity: 400 mAh 3.7-4.2V solder-wire Use time: 80% volume playback: 2-3 hours, maximum volume playback: 1-1.5 hours