Ultrasonic Anion Aroma Diffuser with Built-in Water Level Sensor Material: plastic shell Size: 12.0 x 17.2cm Fixed unite includes: aroma diffuser machine, adapter, instruction manual, color box, measuring cup, and 3pcs essential oil (10mL) 4-in-1 functions: fragrance maker, mini-humidifier, air purifier, and ionizer Utilizing ultrasonic technology, no heating, no burning, and full ingredients of essential oil diffused to the air Helping to relax with natural essential oil added Improves air quality, prevents damage from second-hand smoke, stale air, and allergies Built-in water level sensor avoid operation with insufficient or no water Two operation mode: nonstop made or interval made (30s on and 30s off) Three colors optional: pearl white, pink, and light green Safety standard CE certificate is available RoHS compliance (RoHS consolidation report is available) GS certified (GS certificate is available for adapter)