A "16800mAh Portable Power Bank & Diesel Petrol Car Jump Starter with Air Compressor" is a multifunctional device designed to provide power for various applications, primarily for vehicles and electronic devices. Here are the main features and functions typically found in such a device:Portable Power Bank: The power bank function allows you to charge various electronic devices such as smartphones, tablets, laptops, cameras, and more. The 16800mAh capacity indicates the amount of energy the power bank can store, providing multiple charges for most smartphones and other small electronic devices.Car Jump Starter: This device includes jumper cables and a built-in battery capable of jump-starting vehicles with gasoline or diesel engines. It can provide the necessary power to start a car with a dead battery, eliminating the need for another vehicle to jump-start your car.Air Compressor: The air compressor feature allows you to inflate tires or other inflatable objects such as sports balls, inflatable mattresses, and pool floats. This can be especially useful in emergencies or situations where access to a traditional air compressor is limited.Safety Protections: Most devices come with safety features such as over-current protection, short-circuit protection, reverse polarity protection, and overcharge protection to prevent damage to the device or connected equipment.LED Flashlight: Many portable jump starters include a built-in LED flashlight with different modes (e.g. , steady light, strobe, SOS) for emergency lighting purposes.Compact and Portable Design: These devices are designed to be compact and lightweight, making them easy to carry in a vehicle's glove compartment or emergency kit.LCD Display: Some models feature an LCD screen that displays important information such as battery level, output voltage, and charging status.USB Ports: In addition to jump-starting capabilities, the device typically includes USB ports for charging electronic devices, allowing you to power or recharge multiple devices simultaneously.Overall, a 16800mAh portable power bank and car jump starter with an air compressor is a versatile and essential tool for vehicle emergencies and outdoor activities. It provides peace of mind knowing that you have backup power for your electronic devices and the ability to jump-start your vehicle or inflate tires wherever you are.