• Housed in a tough composite case, this unit is designed to prevent damaging voltage spikes and surges reaching delicate vehicle electronics.• Clips across the battery terminals and permits processes such as welding and plasma cutting to be carried out without the danger of damaging the vehicle’s on board electronics.• Fitting recommended before any routine workshop maintenance.• Shows green light when operating correctly and red light for fault.• Fitted with heavy-duty, fully insulated battery clips.Housed in tough composite case, this unit is designed to prevent damaging voltage spikes and surges reaching delicate vehicle electronics. Clips across the battery terminals and permits processes such as welding and plasma cutting to be carried out without the danger of damaging the vehicle’s onboard electronics. Fitting recommended before any routine workshop maintenance. Shows green light when operating correctly and red light for fault. Fitted with heavy-duty, fully insulated battery c