Fixed Volume Piston with Filtered O-ring Bypass;“Low Battery” Flashing LED;“User in View” Flashing LED;No External Volume Adjustment to Ensure Water Conservation;True Mechanical Override Flush Button;72-Hour Sentinel Flush;Sweat Solder Adapter w/Cover Tube and Cast Wall Flange with Set Screw;Packing, Stop Seat and Vacuum Breaker Molded from PERMEX;Rubber Compound fChloramine resistance;Four (4) Size C batteries included;1” I.P.S. Screwdriver Bak-Chek Angle Stop with Free Spinning Vandal Resistant Stop Cap