simplehuman 8-Ounce Spout Sensor Pump for Soap or Sanitizer, Polished Volume control: easy-to-use buttons control how much soap, lotion or sanitizer to dispense. No messy spills: wide opening makes refills fast, easy and mess-free Clear soap chamber: shows soap level at a glance Intuitive led: lights up green when sensor is activated, and turns red to signal low battery power Requires 4 aa batteries (not included):