PriorityStart! a TOTALLY AUTOMATIC 12 or 24 volt Electro-Mechanical computerized on/off battery protection system 20 years proven technology. Simple Do-It-Yourself 3 easy step installation. Stops battery from going dead, preventing damage to battery, alternator, and electrical system (surge protection). Monitors battery voltage when the engine is off. If battery voltage drops below 11.7V (23.6V for 24V model) for any reason, PriorityStart! Automatically Disconnects the drain, leaving starting power! To start the engine, simply operate brakes, lights, accessories, (bilge pump on boat) any small load change (0.2mV) and PriorityStart! Automatically Reconnects, you can start the engine. No raising the hood, No remote to carry, No button to push, No Dead Battery. PriorityStart! pays for itself first time it saves the battery. A dead battery costs time, money, and permanently damages the battery. Protect your batterys life and power with PriorityStart! See each model for more specifics.