Features: 90 rotatable head flat bottom surface make it easy to transform between handheld fan and desktop fan. 2 modes: fan mode cooling fan mode. Adopting unique water cooling technique, equipped with reusable sponge, just add water to activate the cooling function. Just take out the sponge if you want to use normal fan mode. Built-in a 18650 lithium battery, USB rechargeable, easily to charge by all ordinary USB interfaces: computer, mobile charger, etc. With LED indicator to clearly show the charging working state. Usage Method: 1. Open the back cover and remove the sponge. 2. Soak the sponge with cold water. 3. Place the sponge back into the body(Make sure there is no dripping). 4. Install the cover well and turn on the switch.