This is a brand new unit. I upgraded to the REDARC Alpha model prior to installation when I upgraded the size of my battery bank. So this comes in the box and has never been connected. Selling for LESS THAN HALF THE LOWEST PRICE you can find. One of the best features of these Australian units is they can be mounted in the engine bay or under the vehicle (I mount my ALPHA unit under my van) as they are 100% weatherproof. The REDARC BCDC1225D In-vehicle Dual Battery Charger is a 12 volt, 25A in-vehicle DC-DC battery charger designed to charge your secondary battery banks to 100% state of charge while on the move. Charges your auxiliary battery on the go with DC (alternator) and solar. Keeps your fridge running and your food and beers cold. Works with all battery types, including lithium. Install anywhere: heat, water, dust and vibration proof. Maximize battery life. Suitable for both 12v or 24v vehicles. Overcomes voltage drop caused by long cable runs. Features & Benefits" Separate DC And Solar Charging Inputs Maximizes The Performance And Life Of Your Auxiliary Battery Simultaneous DC And Solar Charging With Green Power Priority Suits 12 Volt Or 24 Volt Standard And Variable Voltage Or Smart Alternators Suitable For AGM, GEL, Standard Lead Acid, Calcium And LiFePO4 batteries