The knipex pen style control cabinet key has a fibreglass reinforced plastic tool body is non conductive and ensures safety with four different key profiles that can be utilised by swivelling the key holder and a universal 14in bit adaptor for standard bits the device switches off automatically after 2 minutes not in use to conserve battery power provides contactless detection of alternating current with an optical indication red led range of voltage 50 600 volts and a frequency range of 50 60h