1. Effect of use. Physical micro-current is used to assist sleep, and the effect of first experience is not obvious. According to different personal conditions, stick to use. 2. 1000mAh lithium battery is used for charging and endurance, and type-c charging is used. It can be fully in 3 hours, and the standby time of fully is several hours. 3. Power display. When the product work light is flashing red, it means that it is almost out of power and needs to be . When it is charging, the work light flash green, and fully work light always display green. (Note: please do not use the product when it is charging). 4. The gear adjustment gear is 9 gears in total. Select the appropriate gear according to your own needs. The gear strength should not be too high, otherwise it cause dizziness, nausea and other adverse reaction, which vary according to personal . (3-5 gears are recommended for general strength). 5. Mode selection. There are three modes in total. Select the appropriate mode according to your own needs. (The modes include comfort mode, stimulation mode and enhancement mode) Charge mode:USB Working principle:CES micro-current pulse Input/output:DC5V/1A Charging time:2H Rated power:1.5W Battery capacity:1000mAh Pulse gear:9 gears Light indication:the work indicator light is permanently on (green) Colour:Black Material:abs Package Contents: 1 * sleep device 1 * ear clip cable 1 * type-c cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.