The Draper 12V Power Pack is the must-have multi-function car maintenance tool for the serious DIY or enthusiast car owner.Built-in air compressor for convenient tyre maintenancePower take-off for USB charging and 12V DC outputBattery voltage indicator to ensure correct battery checking and maintenanceLED work light for working in poor visibilityThe reverse polarity warning indicator helps prevent damage when connecting to the batteryThe Power Pack/Booster is designed primarily for starting petrol and diesel engines with flat batteries, but this multi-function powerhouse also features a 12V DC to power supply for 12V electrical devices from the inbuilt 12V DC output socket, USB output socket, LED work light for use in dark environments and a built-in compressor for essential tyre maintenance.User operational information is presented via a battery voltage meter, polarity indicator and an air pressure gauge, whilst the air compressor accessories compartment and dedicated negative and pos