It may be placed in any position on the appropriate grid or plate. The GRTL MK ILM can also be operated by slave push buttons. The GRTL MK ILM has an illuminated push button for easy location in the dark. These time lag switches are in a grid module format. DANLERS manufacture three versions, one to suit the MK Grid Plus, one to suit the Crabtree grid and one to suit Eurodata plates. They may be placed in any position on the appropriate grid or plate. These grid time lag switches can be wired in parallel to operate the same load. They can also be operated by slave push buttons. For MK Grid Plus Adjustable time lag - 2 mins to 2 hrs 2 wire version No neutral needed Min load 2W resistive With illuminated push button.