Product details:1, wireless binaural stereo, left and right ear channel separation, HIFI sound effects.2. The left and right ears can be used separately (mono) and can be used together in pairs (stereo).3, the British CSR Bluetooth program, dual-mode Bluetooth version 4.2, using 2.4GHZ Bluetooth band.4, the left and right ears are built-in 65mAh special custom steel shell rechargeable lithium battery.5, Bluetooth distance: barrier-free straight line distance of 10-20 meters, barrier-free 360 ° arbitrary angle of 10 meters.6, endurance: continuous listening to the phone call up to 4 hours.7, charging: using Nokia charging interface, quickly fill the battery 100% within 60 minutes.8, built-in high sensitivity (-38db) MIC.9, built-in CVC6.0 noise cancellation technology, providing quiet call effects.10, 1 drag 2 function, you can connect two mobile phones at the same time.11, battery voltage real-time monitoring, low voltage warning, ultra-low voltage automatic shutdown protection.