An automatic liquid dispenser is a device that automatically dispenses liquid to a person who is in need of it. These devices can be either free-standing or wall-mounted. Some have a removable tray that catches any spills. Often, dispensers operate by emitting an infrared signal. When a person's hand or other object intersects with this signal, the dispenser dispenses the liquid. These devices usually have a switch to turn off the signal when not in use. This helps to prolong the life of the batteries.

Another feature of automatic liquid dispensers is their convenience. The devices are easy to install and can be mounted on a wall. Some models can hold 700ml of liquid. They can also be locked to prevent unauthorized use. They run on 4 AA batteries and can last up to 6 months. Some models can be recharged via a micro-USB connection. A LED indicator light will let the user know when the dispenser needs a refill.

Automatic liquid dispensers are also available with an interchangeable volumetric bulb to ensure reproducible volumes. The volumetric bulb is a 14/20 mm (1/4-in) diameter sphere that is placed in the flask. The dispensing apparatus is composed of a head, a flask, and a clip.

Automatic liquid dispensers also help to prevent cross-infection by eliminating the need for dirty hands to touch a soap bottle. They also come with a built-in infrared sensor. When your hand is under the sensor, the dispenser starts the flow of liquid and stops when your hand is away from it.