Warmly Reminder 1. 4 * AAA batteries needed. Check "+" and "-" carefully before installing. 2. 1st time use, please poke the black noozle by your hand 3~4 times so airflow is unblocked. 3. If blue light is on but not soap dispensed, please change brand new batteries for this Automatic Soap Dispenser. . Touch-less: Build-in infrared smart sensor - no need to touch any buttons. The sensor will detect once your hands approach. Then soap will come out automatically. . Sensitivity Touchless Soap Dispenser: Just need 0.25 seconds induction time to pump the soap out and motion Range of 0~2.36 inches. With a built-in accurate infrared motion & PIR sensor detection technology, soap dispenser is so smart to avoid the second cross-infection. Don't need to wave your hands. . Water Proof Touchless Soap Dispenser: Sealing technology prevent the soap or water to corrode circuit board. Waterproof battery base helps to prevent the battery compartment from getting soaked in water which causes corrosion and the dispenser fail to operate. . Energy Efficient Automatic Soap Dispenser: with 4 new AAA batteries(NOT INCLUDED), you will be able to use around 4~6 months. Easy to Use: Only 3 simple steps and you can use it, also very easy for a kid. .