K9 Bluetooth Microphone And Audio 1. Bluetooth specification: Bluetooth V5.0+EDR 2. Effective distance: less than or equal to 10 meters 3. Frequency range: 2.4G-2.80GHZ 4. Transmitting power: 4dB 5. Receiving sensitivity: -90dBm 6. Output power: 3W 7. Audio signal to noise ratio: greater than 75dB 8. USB charging voltage: DC5V 9. Working voltage: 3.7V 10. Built-in battery: lithium battery 600mAh 11. Playing time: 4-5 hours (60% volume) 12. Audio input: Bluetooth, AUX 13. Product specifications: 180x53x47mm 14. Product weight: 138g/238g 15. Audio input: Bluetooth, plug-in 16. Microphone function: After Bluetooth connection, open the singing APP and sing your singing anytime and anywhere. Can be used for conference hosting, friends gathering, stage performance 17. Ear return function, can link to external high-power equipment to amplify sound effects 18. Cute cartoon design, ABS and silicone environmentally friendly materials 19. 3W speaker + diaphragm design, super enjoyment of high- sound 20. Magic sound function, double click the middle button to enjoy happy time easily