This calming essential oil diffuser is electric and made of blown glass. It can plug into any USB power bank. 7 light options, including 7 color fade. Holds 80ml of water, and acts as a humidifier. Use with lights or without. Use with water and oils, be our without. 4 timer functions (continuous, 20/10 second just interval, 1 hour, or 2 hour). This diffuser is often found for $70 or more at other retailers!