OPPO | Enco W31 Wireless Earphone

Driver: 7mm dynamic driver
Driver sensitivity : 95 dB @ 1kHZ
Frequency response range : 20Hz ~ 20kHz
Microphone sensitivity : -38 dBV/Pa
Bluetooth version : BT 5.0
Wireless range : 10m
Battery type : rechargeable lithium-ion battery
Battery capacity : 25mAh (headphones) & 350mAh (charging case)
Music play time (50% volume) : 3.5h (single charge) & 15h (with charging case)
Charging time* : 2.5h (with charging case)
Charging port : USB Type-C
Water resistance (headphones) : IPX4
Weight (Entire device) : 50g