Simplehuman BT1017 Spout Sensor Soap Pump Operates on 4 AA batteries (not included) Easy-to-use badges - interchangeable magnetic soap and lotion badges help you keep track of what's inside the soap pump Auto on/off switch - deactivates sensor when the soap pump is lifted up Four volume settings - allow you to control the amount of soap or lotion dispensed Easy to refill - soap chamber has a twist-off lid for easy refills