Abstract: An electronics enclosure assembly includes: a housing having a convex side and a concave side opposite the convex side; at least one electronic device arranged within the housing; and a mounting stem having at least a shank portion extending from the concave side of the housing for connecting the housing to a valve of a needle-inflated ball. A support spans an interior of the housing for transferring an impact force around the at least one electronic device. Upon connecting the housing to a valve of a needle-inflated ball by insertion of the shank portion of the mounting stem into the valve, the housing resides outside of the ball.