Note: This smart cable can support current less than 650A. Please make sure the peak current of your jump starter is less than 650A, otherwise your jump starter may be damaged.Anti-short connection protection and anti-overdischarge protection: Low voltage start, LED flashes with the frequency of 1 Hz when the voltage is below 10.5 VAnti-reverse charging protection: After starting the vehicle, the anti-reverse charging current is less than 1AAnti-reverse polarity protection: Reverse polarity protection with the negative and positive end of the terminal and battery port. No damage, no sparks1. Check if your car starter has enough power before starting. 2. Insert the battery clamps into the jump starter, the red LED flashes. 3. Connect the battery terminals to the car battery, red to positive +, black to negative. 4. After starting the vehicle, pull the battery terminals from the jump starter.