OPTIMA ® SMOOTH Side-Mount-Operator-Over-The-Handle Flushometer Retrofit Kit Sloan SMOOTH works out of the box. Simply slide the unit over the Flushometer handle and tighten the clamp. Within minutes, the Sloan SMOOTH converts many Manual Flushometers to Sensor Activated.ADA Compliant OPTIMA ® SMOOTH Battery Powered Infrared Sensor for automatic "Hands-free" operationSensor with Automatic Range AdjustmentChrome Plated Metal Sensor HousingMechanical Manual Override Flush Handle Four (4) Size C Batteries included"Low Battery" Flashing LED"User in View" Flashing LEDInstallation requires use of a standard screwdriver