Terrible design and very useless clamp length which is very hard to operate! Also if you wish to jump start empty or completely flat batteries the led will stuck at blinking mode and wont allow you until you take the clamps out and reconnect again.. Very hard to hold at hand with no anti slip design,it is as slippery as an eel when you have oily hands. If you drop it when terminal adapter is connected say bye bye to it as there is no way to match connectors as they use special connectors. I am regretful that i bought this.