【The Heavy Duty Series】: This 4000A Green Keeper 24V jump starter is designed for almost all vehicles and equipment with up to 10.0L gasoline and 10.1L diesel engines - including RVs, carriages, buses, trucks (up to class 8) - agricultural and construction equipment (up to 16 cylinders) - engineered to tackle the toughest engine starts with reliability in all weather conditions from -40°C to +60°C. 
【Intelligent Safety Protection】: Safety is paramount with our UltraSafe battery jump starter pack. Designed for ease of use and peace of mind, it eliminates the risk of incorrect connections or sparks. Our mistake-proof design features 10 safety protections, including spark-proof technology and reverse polarity protection, ensuring a safe connection to any 24-volt battery. 
【Ultimate Portability】: Unlike traditional heavy 24V jumper boxes, this new portable jump starter is lightweight and compact, yet powerful. With the new lithium-ion technology, the weight is reduced enormously, weighing just xx kg (xx pounds) - making it the most suitable road companion. 
【Multi-functional Power Source】: Equipped with a 40,000 mAh battery capacity, this jump starter is also a power bank that offers dual USB output and two-way fast charging with PD65W for charging a phone, laptop, tablet, or drone easily - even simultaneously. Plus, the 12V DC output also works as a power source for any 12V appliances like car pressure washers, vacuum cleaners, and more.
【4-in-1 LED Lights】: The battery jumper features 4 modes of LED lights: Strobe, Lighting, SOS, and Warning. These 4-in-1 flashlights cover different emergency scenarios to ensure your safety in all kinds of situations and adventures.