So there are a few features, but I purchased this for jump starting. I frequently park at the airport for long periods of time. Noticing around 3 weeks my car battery would be dead, i purchased this item. So I've used the product 4 times. Here's the thing. It works, but not perfectly. The first time, I had a issues, but it worked. The best way I can describe the experience is this: Once you hook up the unit per included instructions, it pulses the voltage. The pulse is audible, so you hear it click, and you need to try and start the car in that 3-5 secs it pulses. Every time you attempt a jump, it knocks off 1 out of the 4 lights. Instructs states, you can only jump when above 50% battery life. So 2 out of the 4 lights. So you really get like 2 to 3 attempts, and it becomes too weak. Once I discovered this pulse, and click timing. Its worked reliably. It doesn't comes with a wall charger, but a usb cord.So would I recommend this product?Overall, if your looking for something small, portable, and cheap. YesIf your looking for reliability, the larger jump packs would be a better purchase. But they are much larger and expensive. But they usually have additional features like being able to inflate a tire.