Bluetooth connection: with iOS, Android, Mac and Windows
Model: 3D eye mask
Bluetooth protocol: V5.0
Frequency range: 20HZ-20KHZ
Charging voltage: 3.7V-4.2V
Sensitivity: 88DM
Signal to noise ratio: 90db
Speaker impedance: 32- 15%
Speaker specifications: φ30mm
Operating range: 10m
Charging time: 2H
Use time: 10H (50% volume)
Battery capacity: 200mAh lithium battery
Bluetooth search name: BT-01
Material: memory foam
Product size: 28*14cm
Retail box size: 140mm*118mm*46mm