Features1GOOD PERFORMANCE: The wireless eye cover uses BT V5.0 chip to ensure HiFi stereo, stable and clear call, shocking bass effect. 2WITH BATTERY: The eye cover is equipped with 150mAh battery, continuously play music for 13 hours, with USB charging, efficient and practical. 3FAST TRANSMISSION: The wireless eye cover has fast transmission rate, with an unobstructed distance of more than 20 meters and a maximum of 50 meters. 4MULTIPLE FUNCTIONS: The sleep eye cover has music function, supporting volume control, answering and making calls, English voice prompt, etc. 5 FABRIC: The eye cover is made of silk fabric, you can put a cold or hot compress bag inside, and can adjust the position of the headset.SpecificationItem Type: Wireless Music Eye CoverMaterial: Silk FabricUse Method: HeadwearBattery Capacity: 150mAhBattery Type: Polymer lithium battery (built in battery)Charging Mode: USB ChargingCharging Time: About 2 HoursPlay Time: 13 HoursTalk Time: More than 14 HoursStandby Time: More than 300 HoursBT Specification: V5.0+EDR A2DP AVRCP HFPFrequency Range: 2.402-2.480GHzTransmission Distance: Approx. 20 meter / 65.6ftChannel: StereoSpeaker Parameter: 32/30mmSpeaker Power: 10mW x 2Signal to Noise Ratio: 104dBFunction: Previous song, next song, volume up, volume down, play, pause, answer a call, make a call, for Siri activation, microphone callPackage List1 x Eye Cover1 x USB Charging Cable