Used with Grease Liquid, this new system was developed for versatility – There is a peristaltic pump that pumps 30 ML ( 1 OZ) / min (one shot). For example to empty a gallon in approx. 30 days – program for 4 mins per day. System can be programmed as required to allow as many shots as required per 24 hour period. It will fit a 1 US Gallon container or 5 liter container. The system operated on D Cell Batteries (not included) or rechargeable battery (included with US charger- Can be used in Europe with a US adaptor.) If used to empty a gallon or 5 litre unit per month – rechargeable battery life can be up to 90 days before a charge. You can alternate use from one battery type to the other – at the flick of a switch. There is also a Micro Drip Injection System. Convenient sized, wall mounted dosing system runs on C-batteries. Ideal for installation in tight or out of the way areas. Perfect for precise application of drain line prevention products to combat Urine, Grease and Odors. The is a slot in the front door to check fluid levels without having to open the unit.