Quiet, Exposed, Piston Type, Chrome Plated Closet Flushometer with the following features: ADA Compliant OPTIMA® Battery Powered Infrared Sensor for automatic " No Hands" operation ;Chrome Plated Infrared Sensor Housing w/ Angled Sensor Window |Fixed Volume Piston with Filtered O-ring Bypass ;Manual Override Flush Button ;"Low Battery" Flashing LED with Optional Audio Tone - Four (4) Size C Batteries included and "User in View" Flashing LED |Optional 24 Hour Sentinel Flush |Infrared Sensor Range Adjustment Screw and Reset Button |EBV-157 Handle Adapter Kit |1" I.P.S. Screwdriver Bak-ChekTM Angle Stop and Locking Vandal Resistant Stop Cap |Adjustable Tailpiece |Vacuum Breaker Flush Connection |Spud Coupling, Wall and Spud Flanges for 1" Top Spud |High Copper, Low Zinc Brass Castings for De-zincification Resistance |No External Volume Adjustment to Ensure Water Conservation ;Sloan OPTIMA® SMO equipped Flushometers provide the ultimate in sanitary protection and automatic operation. There is no need for AC hookups or wall alterations. The Flushometer operates by means of a battery powered infrared sensor. Once the user enters the sensor's effective range and then steps away, the Side Mount Unit initiates the flushing cycle to flush the fixture. The unit is hygienic because the user makes no physical contact with the flushometer surface except to initiate the Override Button when required. 24 hour Sentinel Flush keeps the fixture fresh during periods of non-use. Automatic operation provides water usage savings over other flushing devices. Reduces maintenance and operation costs. Installation and battery replacement does not require turning off water to the valve.