TPU Cover to protect the contacts for compatible Garmin watches. Tested on Fenxi 5 and 7, and also VivoActive. Protects the sensitive contact pins against corrosion caused by skin contact and residual acids. Prolongs the life of the charge contact pins. Does not seal watertight, so please remove and dry off pins after being in water or sweating profusely. Have been using this design on my Garming watches for three years without any issues. Has a little tab to asisst in removing from the charging port. TIP: Print in bright color TPU so you can see them is they lie around!