Zurn model ZERK-CP is sensor operated battery-powered retrofit kit for water closet and urinal flush valves. This product offers high impact-resistant chrome plated plastic cover with replaceable tempered glass lens. Designed to provide automatic flushing for urinal and/or water closet flush valves, the unit features an adjustable automatic infrared sensor. It offers user-in-view LED low battery indicator light. It features a switchable 24-hour auto-flush, 10° angled sensor and a courtesy flush button. This unit comes complete with 4 "c" size batteries, wrench for installation, and an Allen key for battery compartment.