CS FREE gives you the freedom to charge and maintenance charge any type of 12 V lead or lithium battery wherever you are - even if you don't have access to an electrical outlet. Use it as a portable charger to top up your battery with mains power, or connect it to a solar panel or 12V battery for complete charging freedom wherever wherever you are on your way. CS FREE also features our revolutionary Adaptive Boost technology, so if your vehicle won't start, simply plug it in to let CS FREE automatically analyze the condition of the battery. It will then work in the safest and fastest way to give the battery the power it needs to start your vehicle within 15 minutes. Unlike most jump starters, CS FREE is sensitive and safe, it avoids damaging your battery or your car's electronics by only giving the battery the charge it needs to get you going. CS FREE is also a smart maintenance charger and advanced power bank to keep the battery and technology running so they are always ready for use. Four advanced products in one portable device – Adaptive Booster, battery charger, smart maintenance charger and advanced power bank. • Multifunctional portable charging and trickle charger that you can use wherever preferably without being tied to any electrical outlet • Connected to the mains or connected to a solar panel or a 12 V battery for complete charging freedom • Adaptive Boost is the safest way to set jump start a dead battery to get you started within 15 minutes • Smart maintainer charger and advanced power bank to keep the battery and technology in top condition