Product Description Save A Battery 12 Volt Battery Maintainer and Tester Combo charges dead batteries quickly using pulsing technology. It monitors the batteries condition and offers audible alarm sounds if something goes wrong. This maintainer and tester combo extends battery life the longer it is plugged in. It offers a modular design for versatile operation cables that can be changed quickly and easily. This maintainer and tester combo makes it easy to connect cables with the combo package, providing total versatility. It includes a built in load tester and voltmeter for added diagnostics. Amazon.com The Save A Battery 12-Volt Battery Charger Maintainer and Tester Alarm Combo Pack brings together two of the most versatile battery charging devices on the market. The Charger/Maintainer can quickly charge, condition, and maintain any 12-Volt battery. The separate Tester Alarm and Voltmeter unit can test all automotive electrical circuits and charging systems, and can monitor your battery's condition with a built-in audible alarm. These compact units are highly portable, and the innovative modular cord system makes them easy to connect with virtually any vehicle. The Save A Battery is easy to read and operate. Save Time and Money by Keeping Your Battery Charged It's a fact: batteries naturally discharge over time, even when not connected to a vehicle. If you own a classic car, RV, motorcycle, or any other vehicle that isn't used regularly, you may have experienced this first-hand. Not only is it frustrating, but a dead battery also costs you time and money to recharge or replace. The Save A Battery 12-Volt Battery Charger Maintainer and Tester Alarm Combo Pack gives you the tools to keep your batteries in perfect, charged condition. Each unit can be used separately or together, providing you with the flexibility you need. The Charger/Maintainer unit has a 50-Watt output that will charge a dead battery fast. Solid-state microprocessor technology provides it with twice the output and efficiency of older chargers that use transformer technology. This means less heat, less energy, and a greener world. Once the battery is charged, the unit switches modes to maintain and monitor optimal performance levels while extending its life by years. The included Battery Tester Alarm Monitor and Voltmeter unit gives you real-time battery and electrical system information that is easy to read and understand. It doesn't even need to be plugged into a wall outlet to work. Simply attach it to your battery and the display will show you the information you need. The built-in audible alarm will alert you if the battery's charge gets too low, indicating that it is time to charge the battery. An on-board Load Tester provides a way to test and cycle weak batteries and bring them back to life. It even has Voltmeter functionality that can be used to diagnose in-car wiring and check the alternator, generator, or dynamo. The modular design provides multiple connection options. Safe and Easy to Set Up and Operate The Save A Battery 12-Volt Battery Charger Maintainer and Tester Alarm Combo Pack comes equipped with features to keep you and your vehicle safe, and is a snap to set up and use. It won't cause sparks when you connect it to your vehicle, and will alert you if it has been connected in reverse polarity. Over-current, over-voltage and short-circuit protection are also included. The large LCD screen and bright LED banks make it easy to monitor charging mode, connection status, voltage, and overall battery health. The Save A Battery 12-Volt Battery Charger Maintainer and Tester Alarm Combo Pack also features an innovative modular cable design that makes it easy to connect to any battery or vehicle. You can choose to connect with the 5-Amp battery terminal lug cable or the alligator clip cable. Even the AC power cable is modular and removable. All cables come with gold-plated connectors that are suited for long cable runs and improved reliability in harsh environments. The bright yellow cable jacket is easy to see, and helps eliminate accidental disconnects. Additional cables (sold separately) are also available with different connection types and longer lengths. What's in the Box? The Save A Battery 12-Volt Battery Charger Maintainer and Tester Alarm Combo Pack includes the Charger/Maintainer unit, the Tester Alarm Monitor and Voltmeter unit, a 6-foot 5-Amp battery terminal lug cable, a 2-foot 5-Amp battery terminal lug cable, a 6-foot alligator clip cable, a 6-foot cigarette lighter adapter cable, a 3-foot Voltmeter probe, a 20-foot modular extension cable, a 1-foot patch cable, a 10-foot AC power input cable, and mounting brackets for permanent wall or vehicle installation.