This adaptor allows laptop leads with 'cloverleaf' or 'mickey mouse' plugs to be tested. Just plug the adaptor into the PAT-IT or the BattPAT and connect the lead into the adaptor socket. Plug the other end of the lead into the IEC testing socket on the PAT-IT or the BattPAT. Press the IEC test button on the PAT-IT (Power Cord button on the BattPAT) to carry out the test.