Handy design and light-weight with rechargeable battery pack Features Handy design…with built-in detachable rechargeable battery pack, compact and light-weight Easy to use…uses water as ultrasonic conducting medium, no gel is required Silent operation…thanks to the ultrasonic vibration technology 3-speed nebulization rate control…provides optimal treatment for different density Built-in timer…automatically shuts off after 10 minutes use Electromagnetic compatibility…complies with EN60601-1-2 requirementas specified in EC directive 89/336/EEC