Features： 1、GOOD PERFORMANCE: The wireless eye cover uses BT V5.0 chip to ensure HiFi stereo, stable and clear call, shocking bass effect. 2、WITH BATTERY: The eye cover is equipped with 150mAh battery, continuously play music for 13 hours, with USB charging, efficient and practical. 3、FAST TRANSMISSION: The wireless eye cover has fast transmission rate, with an unobstructed distance of more than 20 meters and a maximum of 50 meters. 4、MULTIPLE 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. Specification： Item Type: Wireless Music Eye Cover Material: Silk Fabric Use Method: Headwear Battery Capacity: 150mAh Battery Type: Polymer lithium battery (built in battery) Charging Mode: USB Charging Charging Time: About 2 Hours Play Time: 13 Hours Talk Time: More than 14 Hours Standby Time: More than 300 Hours BT Specification: V5.0+EDR A2DP AVRCP HFP Frequency Range: 2.402-2.480GHz Transmission Distance: Approx. 20 meter / 65.6ft Channel: Stereo Speaker Parameter: 32Ω/30mm Speaker Power: 10mW x 2 Signal to Noise Ratio: 104dB Function: Previous song, next song, volume up, volume down, play, pause, answer a call, make a call, for Siri activation, microphone call Package List： 1 x Eye Cover 1 x USB Charging Cable