OverviewModel: ENC-9 Pro Bluetooth Earbuds Wearing method: In-ear Bluetooth: Version 5.2 Bluetooth effective distance: 10m Microphone sensitivity: 42 DBV/Pa Battery Type: Rechargeable lithiom ion battery Battery capacity: 50mAh (headphones) 320mAh (charging box) Music playing time: (50% volume) 8-9h (single charging) 30h (with charging case) Charging time: 30min(headphone)/110min (with charging box)