I love all the safety measures Zeusray has put in place in this multifunction car jumper! These are the two safety features that I appreciate the most: Jumper cables are clearly labeled—red (+) and black (-). If that isn’t enough, they’ve also built-in anti-reverse connection protection. Basically the unit recognizes if you’ve connected the car jumper cables on the wrong terminals of your battery. When it detects this, an error message display on the unit (Err1) and will also alert you with a buzzing sound. They’ve also built-in temperature control protection. Right off the bat when you attach the jumper cables, it will give you a temperature reading. Anything above 45 Celsius or 113 Fahrenheit will prevent the car jumper from starting. While this device can be used as a car jumper, it also functions as a power bank. The device packs 12000mAh of juice. That’s enough power to fully charge an iPhone 6 Plus up to 3 times! More than enough power that you’ll need in emergency situations where your phone is completely dead and you need to make a phone call. After immediately powering on the unit, the display will show you percentage of the device is charged. It also has a built-in flashlight. To power on the flashlight, you simply press and hold the power button for a few seconds. This is a great multi-function tool to have, especially for those who aren’t so car experts and wouldn’t normally know what to do to jump start a car. I received this product at a discounted price as part of a sample testing. I have provided my honest and unbiased review.