Features: Charging time: 2-2.5 hours. Bluetooth continuous working time: no less than 9 hours. You can adjust the size of the eye mask according to the size of your head. Washable: easy to disassemble the speaker, then easy to clean. how to use? First: Turn off all Bluetooth devices, such as smart phones, computers, TVs, etc. Second: Press and hold the "on/off" button for about 5 seconds, until the red/blue light flashes, indicating that the eye mask is turned on. Third: Turn on Bluetooth and find the Bluetooth name Bt-faah, connect. Fourth: After connecting to Bluetooth, you can listen to music comfortably. Note: It can only connect to one Bluetooth device. If you need to connect another device, please cancel the first device first. Turn on the Bluetooth of the mobile phone and match the Bluetooth name "bt-faah" to adjust the volume to your own needs. If there is environmental interference, the sound may be a bit noisy. How to wash it? Take out the Bluetooth microphone first, then wash it with warm water and let it dry naturally. Package includes: 1x Bluetooth sleep eye mask 1xusb charging cable