1. When cleaning or emptying the base or tank, be careful to prevent water from getting inside the air outlet. 2. Don't add essential oils from mist outlet hole directly.wrong operation may cause outlet hole blocked. 3. Don't power on when waterless. 4.Not rated for damp locations,keep bottom part always dry and keep water tank in dry and cool place. 5.Clean the middle hole of he water tank with cotton swab regularly after 3-5 times using. 6.The diffuser only works with 24V DC adapter.