Amazing emergency device, especially now with the quarantine when we leave our cars parked for a long time without moving them. All you have to do is connect the red and black "clamps" to the corresponding poles of your car battery, turn it on, start the car, and that's it! So simple and easy. It works independently, without the need for assistance from another vehicle, and your car is ready to go!
You can keep it in the trunk or even in your bag if you want to charge your phone or tablet since it also functions as a power bank. It is a bit heavy for the bag, though. It also has a built-in flashlight.
It truly deserves if you leave your car for a long time without moving it and you're afraid of running out of battery. It has saved me!