This is a little cover for an XT90-s Loop Key. It makes removal of the loop key much simpler and allows you the ability to color cordinate the loop key with your
...Plus board :).
XT90-S Anti Spark
http://www.ebay.com/itm/5-Pair-Amass-XT90-S-Anti-Spark-4-5mm-Connector-Plug-Male-Female-For-ESC-Battery-/291454334743?hash=item43dc083717:g:ejIAAOSwtnpXmseZ