Sealey Booster Cables 16mm² x 3m 400A Electronics Protection BC16403SRPVC sheathed copper coated aluminium cables give maximum power transfer yet remain flexible. Resistant to oil, grease and most acids. Insulated heavy duty clamps reduce the heating effect of power transfer. Features an LED display unit which shows the battery voltage and includes a reverse polarity indicator and alarm. In line surge protector helps to prevent electrical spikes occurring. Additional features also include alternator charge check and