I needed a cover for the buttons on the Noco Boost XL GB50 as they are quite sensitive and turn on/off easily. I tend to toss the unit in the trunk of my car or the motorbike panniers.
The cover is really simple :-) It fits the grooves of the Noco unit so that it doesn't slide and is simply held in place by a rubber band.
The author hasn't provided the model origin yet.