Es67 Perception, Wireless Earphones, Bt V5.3, 130Mah Battery For 20 Hours Of Use And 350 Hours Of Standby 1. Bt Version: V5.3. Chip: Ac7003. 2. Supported Protocols: Headset, Hands-Free, A2Dp, Avrcp. 3. Transmission Distance: 10M. 4. Transmission Frequency: 2.4Ghz. 5. Speaker Unit: 14.2Mm. 6. Impedance: 32Ω ± 15%. 7. Frequency Response: 20-20000Hz. 8. Sensitivity: 92Db ± 3Db. 9. Battery Capacity: 130Mah. 10. Charging Input: Dc5V, Type-C. 11. Charging Time: About 2 Hours. 12. Talk / Music Time: 20 Hours. Standby Time: 350 Hours. 13. Earcups With Magnets. Silicone Neck Band. 14. Battery Display: Supports For Apple Phones And Some Android Phones. 15. Length: 88Cm. 16. Weight: 20.8G.