Teswell Wood Grain 140ml Aromatherapy Essential Oil Diffuser Ultrasonic Whisper Quite Cool Mist Aroma Humidifier with 7 Changing Lights Waterless Auto Shut Off Function Classic wood grain design makes it a modern stylish ornament for your room 140ml water tank provides about 8 hours mist time; Auto-off protection when water is runing out With several drops of essential oils(not included), it will give you a soothing environment with lovely fragrance The negative ion released by the diffuser helps you relieve from tired work with refreshing air With 7 soothing color LED light, you can set it on auto changing modes or steady on one color