1. Audio transmission format: A2DP/HFP/AVRCP 2. Ear talk time: 4 hours 3. On-ear music time: 4-5 hours 4. Signal-to-noise ratio: greater than 95DB 5. Transmission range (HZ): 2.402GHz-2.480GHz 6. Working voltage: 3.0V-4.2V 7. Microphone sensitivity: -42db 8. Battery capacity: Headphones (50mAh) 9. Automatic connection: in the state of shutdown, take it out from the charging compartment at the same time 10. Channel: Left and right earphones can be used as mono earphones 11. No connection state: Double-click the headset function key to enter the TWS state 12. Start SIRI: Triple tap left/right Headphone touch panel Headphone panel: Button 13. Other functions: portable, bluetooth function, support FM radio, TF card, USB, AUX playback, call function, TWS, charging compartment with bluetooth headset