Harmony XAL Control Stations The Harmony XAL series control stations come in a polycarbonate two-tone housing with a Start / Stop push button. 22 mm control stations Momentary push button Flush or mushroom head Start / Stop Function Polycarbonate housing Light grey base (RAL 7035) and dark grey lid (RAL 7016) Stainless steel fixing screws Contacts attached using bracket screws Stock no. contact type button type 609-9961 1 N/O Flush green on "on" label 609-4607 1 N/C Red mushroom on "stop" label 815-3092 1 N/O Flush "start" 815-3102 1 N/C Flush "start / stop"