1. Case material: ABS 2. Waterproof grade: IPX 7 3. Bluetooth version: 5.3 4. Rated power: 5W 5. Rated voltage: 3.5V 6. Signal-to-noise ratio: greater than 95dB 7. Battery capacity: 2400mAh 8. Frequency range: 120HZ-20KHZ 9. Connection mode: Bluetooth connection 10. File format: support MP3 WMA WAV 11. Playback time: about 8-10 hours at medium volume level 12. Earphone interface: support 3.5mm audio cable input 13. Weight: single microphone about 685 g, dual microphone about 760 g 14. Size: microphone about 4.1 x 13.8 cm, speaker about 13.7 x 9.5 x 9.5 cm Functional features: 1. Upgraded 5.3 Bluetooth chip, fast connection, stable transmission, excellent sound quality, the microphone adopts 2.4G wireless technology, truly zero delay K song 2. Bluetooth 5.3 technology, fast and stable transmission within 10 meters, nearly lossless sound quality transmission, multiple modes, configuration upgrades, covering Bluetooth, TF card, AUX, headphone monitoring, Type-C charging and other modes 3. High-value subwoofer, high-power speakers, three-dimensional surround sound, long press to cancel the original sound, the original song becomes the accompaniment in a second, a key to switch to enjoy the comfort of good sound quality 4. Professional acoustic debugging, singing bar level surround sound, professional tuner ten million times debugging, to achieve full frequency HFI sound quality, to create a 360-degree stereo reverb beautiful sound 5. Outstanding acoustic, full-frequency dual speakers, high-definition 3-unit dual-frequency dual speakers, with a unique music cavity audiophile-grade acoustic configurations, high-resolution restoration of music details, vocal clarity, layering, such as the scene 6. Built-in sound card level quad-core DSP reverb chip, you can freely adjust the reverb effect intelligent beautification of the human voice, enhance the sound permeability and sense of hierarchy 7. Enjoy th