WHD LST 50 GMP UP, 100V LS Regulator (via transformer), 50 W, Flush-mounted, For Gira LST 100 GI UP, LST 100 GI UP -R, LST 100 ME UP, LST 100 ME UP -R, LST 100 PE UP, LST 100 PE UP -R, Shutter switch cover, Very linear, low-loss LS regulator due to the transformer technology