1.Anti Short connection protection:Connect the red with the black when the is on,No damage2.Anti Over-discharge protection:Low voltage ,LED will flash at the frequency of 1HZ if the voltage is below 10.5V3.Anti-reverse charge protection:After the car is started,Anti-reverse charge current is less than 1A4.Anti Reverse polarity protection:Reverse connection with the Negative and positive end of the clamp and battery terminal,No damage5.Anti High Temperature :When the temperature of the jump is higher than 80 Centigrade,the smart cable will prevent the current ,to protect the jump Instruction:1.Connect the red and black battery clips to the positive and negative of car battery.2.Insert plug of battery clips into outlet of .3.Turn auto key to shift to auto.4.If the auto can not be started, turn the key after several seconds until it is started successfully.5.Afterwards, pull storage battery plug from supply and remove from auto battery.Product Name: Relay Smart Voltage: 12VPractical current: 500A, instantaneous current: 700ACable length: length including head: 36CM red, 28CM blackSuitable for: Low-displacement, high-displacement (1.5, 1.8, 2.0, 2.4, 2.5, 3.0, 3.5) displacement Product features: Multi-function protection type: high voltage protection, low voltage protection, over current protection, low current protection, anti kickback protection, anti reverse connection protection, high temperature protection, low temperature protection, short circuit protection, anti over discharge protectionColour:Photo ColorMaterial:Plastic + MetalPackage Contents:1 x Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.