<br><b>Sleep headphones 3D Bluetooth Eye Mask combines fashion and technology, dressy and business style: </b> <br>Stable Bluetooth connection, ultra-low power, safe RF emissions, block out ambient noise without using earplugs; Enjoying music, voice assistant and hands-free call anywhere and anytime. <br> <br>Whenever, if you are seeking a natural sleep aid that can help you fall asleep quickly, stay asleep for longer and wake up feeling refreshed, then pls take a look at our Bluetooth music sleep mask. <br> <br><b>Specification:</b> <br>Bluetooth version: V5.0 + EDR. <br>Wireless operation range: about 45ft <br>Frequency: 2.402 - 2.480 GHz <br>Rechargeable Li-ion Battery: 3.7V/ 130mAh <br>Charging time: 2 hours <br>Music playing time: up to 10 hours <br>Talking Time: up to 12 hours <br>Standby time: up to 120 hours <br> <br><b>Charging guide:</b> <br>1. Connect the micro USB cable to charger (or computer USB port) to bluetooth eye mask port. <br>2. Our device have a LED indication on the right, RED light means charging, BLUE when fully charged. <br> <br><b>How to connect Bluetooth:</b> <br>1. Make sure our device charged before trying to connect; <br>2. Long press the "ON/OFF" button to red/blue light flash; <br>3. Find "Bluetooth eye mask" connect and enjoying. <br> <br><b>How to wash Bluetooth eye mask:</b> <br>1. Push bluetooth control panel out of its pocket; <br>2. Pull the 2 ultra thin speakers out of its pocket; <br>3. Pull speakers and bluetooth panel out from separated stitching of the sleep mask; <br>4. Hand wash available <br> <br><b>Note: </b> <br>Please move the position of the speakers to align the ears to hear more clearly when use.