To activate your LED Light Up Suspenders, press the button on the battery house, located at back of the suspenders. Activate 1 of 3 light modes: flash, blink & steady. Adjustable Length: 35″-44″ Lower back fabric is able to stretch an additional 9.5″, which brings overall Suspenders Length to 53.5″ at its longest. Comes ready to use with 2 replaceable CR2032 Batteries.