The 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 a 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 or use the refill cartridge with your favorite foam soap. The pump is rechargeable with one charge lasts up to 3 months. Mandarin orange foam hand soap sample plus a refillable cartridge included.