Edifier TWSNB2 True Wireless Earbuds with Active Noise Cancellation, Ambient Mode, Wearing Detection, Master-Slave Switch Function-White Features • True wireless earbuds with Hybrid active noise cancelling technology • Quick Ambient Mode enables you to hear the environment sound such as the traffic or flight announcements • 10mm driver with composite diaphragm delivers music with a wider soundstage • Dual-mic noise cancellation ensures the clarity of phone calls • With wearing detection, the music is automatically played/paused the moment you insert/remove earbuds • The left and right earbuds have master-slave switch function for mono or stereo use • Personalize your settings and find more via EDIFIER CONNECT APP Specifications Bluetooth Version Bluetooth V5.0 Bluetooth Profiles A2DP, AVRCP, HFP, HSP Playback Time 'ANC On: about 7hrs(earbuds)+18hrs(charging case) ANC Off: about 9hrs(earbuds)+23hrs(charging case)' Charging Time About 1.5hrs(earbuds) / 2hrs(charging case) Battery Capacity 60mAh(earbuds) / 500mAh(charging case) Response Frequency 20Hz-20KHz Sensitivity 94± 3dB Impedance 24Ω