Simplehuman foam sensor pump is the most luxurious way to wash your hands, and it's touch-free so no germs or smudges are left behind. Triggered by the fast and precise motion sensor, the aerating diaphragm pump delivers just the right amount of rich, creamy pre-lathered foam. To control the amount of soap desired, you can position your hand up close to the sensor for a little soap and farther away for more. It's also waterproof for easy cleaning. Refills are easy - just eject the old cartridge and insert a new one. The pump is rechargeable - one charge lasts up to 3 months. simplehuman foam hand soap plus a refillable cartridge included.