Dapol O Gauge 7L-004-001 Lynton & Barnstaple Home Square Post Semaphore Signal.  Dapols O Gauge semaphore signals are easy to fit and operate and offer an affordable route to accurately model working OO Gauge signals. All signals work on 14V AC/ 12V DC and feature;Smooth operating servo motorsWorking LED lights with coloured lensesRobust and yet elegant and accurate designEasy to Install Switch included