This is the latest TM version of the fused permanent connection lead - our most popular accessory. This version of the fused eyelet lead is the same format as those supplied with OptiMate (pre 2012) and AccuMate. It has a rubber cover for the 2-pin connector to keep the electrical connects dry and corrosion free. You can use additional leads to fit one to every vehicle which requires its battery to be charged - in this way one OptiMate or AccuMate can be used with several vehicles on a rotational basis very simply and quickly. Simply connect the 2 ring terminals to your battery and the weatherproof 2-pin connector will always be available to connect to your OptiMate, AccuMate, or power accessory without having to delve into the vehicle. This accessory lead will work with: AccuMateAccuMate ProAccuMate Pro-5OptiMate (all 2000-2011, >2012: check)OptiMate Pro-8 (pre 2010)OptiMate Pro-2OptiMate Pro-SOptiMate Pro-8-S (via converter leads). However, if in doubt, please check your connector. NB this lead does not fit OptiMate I or OptiMate II (pre-Sept. 2000).