Zurn model# ZRK-U-1.0 is a RetroFlush AquaSense 'AV' Retrofit Kit. The AquaSense RetroFlush Retrofit Kit is equipped with an infrared sensor, a DC solenoid, and integral battery holder for four AA alkaline batteries. The unit comes complete with tempered glass replaceable lens, four AA batteries, switchable automatic 24 hour flush, maintenance override, switchable courtesy flush, switchable automatic 24 hour flush, range adjustment light, low battery indicator, abnormal reflection indicator, chrome plated metal housing, field adjustable rand, and infrared beam tilt adjustment. The kit also includes a filtered riser tube and a TPE chemical, clog resistant diaphragm kit.