Power Pack/Booster fitted with compressor, work light and 12V DCsocket and USB sockets. Designed for starting petrol and diesel engines with flat batteries, whilst also supplying 12V DC to power 12V electrical devices from the inbuilt 12V DC output socket. Fitted with a LED worklight for use in dark environments and a built - in compressor. Each power pack is also attached with a battery voltage meter, polarity indicator, USB output, air pressure gauge, air compressor accessories compartment, negative and positive clamps.