Feature: 1. Salt stone is a kind of mineral whose main function can release negative ions prevent radiation prevent moisture improve sleep the brain prevent asthma increase immunity and natural beauty. 2. Quiet operation no interruption to work bass operation built‑in 1200 mAh rechargeable battery long battery life easy to use in wireless state. 3. The translucent structure generates a spectrum which can purify the air relieve stress regulate emotions and reduce electromagnetic radiation. 4. 2 level spray adjustment click the button to turn on the continuous spray mode click the button again to turn on the intermittent spray mode and the third time to turn off the spray mode. 5. The large capacity water tank is continuously replenished with 400mL water storage capacity which can meet the humidification needs of one day without frequent water addition and keep moisturizing. Specification: Item Type: Salt Mine Humidifier Material: ABS Size: Approx. 16.4 x 8 x 8cm/6.5 x 3.1 x 3.1in Gross Weight: Approx. 421g/14.9oz Voltage: 5V Current: 1A Power: 2W Battery: Polymer Lithium Battery 1200mAh (Included) Use Time: Continuous Spraying 6h Intermittent Spraying 12h Charging Time: About 2.5 Hours Water Tank Capacity: 400ml Spray Volume: About 45ml/hour Package List: 1 x Humidifier 1 Package x Salt Mine 1 x Manual 2 x Humidifying Stick 1 x Humidifying Stick Tube 1 x USB Power Cord Note: Ship with built‑in battery How to use: 1. Click the button to turn on the continuous spray mode (the night light is on at the same time) 2. Click the button again to turn on the intermittent spray mode 3. Click the button for the third time to turn off the spray mode (the night light turns off at the same time)