This dolly-mounted radar display from Kustom Signals is very portable and yet extremely stable. The SMART 510 has a bright 12 inch tall character LED display which vividly announces for all to see how fast fork lift or other vehicular traffic is going. The optional "SLOW" Violator Alert, with variable set points in 1 MPH increments, sends a distinctive and unmistakable message that "You're Going Too Fast!".