Model No, Operate instruction {11 Press the up button, LED will be flash, und sent one set codes to contra receiver for open. £21 Press the down button, LED will be flash, and sent one sot codes to control receiver for off. (3) Replacement batteries (3V 2032 x 2 pest, when LED fight wore disheartening. When change the batteries, need open the cover, and push down the ellipse bole by tool. PS. Replacement new batteries, “+ must on the up side.