This compact essential oil nebulizer unit is fully portable, wireless, rechargeable, works with on/off touch control. it is perfect for personal use by your bed to prepare your bedroom for deeper sleep (do not run while sleeping) Convenient at your desk and when traveling. It is easily packed in luggage since the glass bottle is protected by a metal cover. The reservoir is glass and no heat is used to disperse the essential oils – only air. It runs for 2 hours (Hope recommends 20-30 minutes) and requires 10-20 drops to run it efficiently. Clean with a Qtip and alcohol. The glass reservoir can be replaced.