Edifier TWS NB2 Pro Wireless Bluetooth Earphone Earbud, Hybrid Noise Cancellation, 10M Effective Distance, Microphone Black Feature: Hybrid Noise Cancellation with 2-way MICs Get rid of the traditional acoustic structure and welcome the upgraded panoramic 3D technology Quick Ambient Mode for hearing any voices from the external environment Single and dual-ear modes for a quick switch In-ear detection to pause your song once you have taken earbuds out Specifications Bluetooth version: V5.0 Effective distance: 10m Playback time: Noise-cancellation on: 7+18h Noise-cancellation off: 9+23h Input: 5V⎓60mA (Earbuds) 5V⎓1A (Charging case) Frequency response: 20Hz-20KHz Sound pressure level: 94±3dB Impedance: 24Ω Product Weight 54g (net weight) Inner Carton 128mm×126mm×67mm (L×W×H), 243g (gross weight)