Key features: ● Bluetooth 5.0 chip, 10m barrier-free connection ● Ergonomic head wear, skin-friendly ear cover, cushion the pain of long-time wearing ● 40mm large dynamic speaker, professional tuner tuning, surround sound ● Super long service time: 20 hours of playback time, 300 hours of standby time ● Full functions: iOS battery display / volume adjustment ● Switch the song / pause / play, answer / hang up the call