Warm Tips: 1. 4*AAA batteries are required (not included). Please check "+" and "-" carefully before installation. 2. When using for the first time, please toggle the black noozle 3~4 times by hand to make the airflow unobstructed. 3. 3. If the blue light is on but no soap is coming out, please replace the batteries with brand new ones for this automatic soap dispenser. No Touch: Built-in infrared smart sensor - no need to touch any buttons. Once your hand is close, the sensor will detect it. The soap will then come out automatically. Sensitive touchless soap dispenser: Only 0.25 seconds of sensing time is needed to draw out the soap, with a range of movement from 0 to 2.36 inches. With built-in precision infrared motion and PIR sensor detection technology, the soap dispenser is so smart to avoid a second cross-contamination. No need to wave your hand. Waterproof contactless soap dispenser: sealing technology prevents soap or water from corroding the circuit board. The waterproof battery base helps to prevent the battery compartment from being soaked in water which could lead to corrosion and the dispenser not operating. Energy efficient automatic soap dispenser: with 4 new AAA batteries (not included) you will be able to use the dispenser for around 4 to 6 months. EASY TO USE: In just 3 simple steps you can use it and it is very easy for children too.