The MJR Series Signal Kit - IR-632092 - is compatible with the MJR-7000 and MJR-8000 time clocks. The plug-in components fit internally to provide 7-day signal schedules with up to 28 signals daily. The signal duration can be programmed for 1 to 15 seconds. The MJR Series Bell Ringer kit can control a signal device from a 120 VAC dry contact switch. This item requires professional services. If purchased with the clock, it will come pre-installed. If purchased separately, signal will come with wiring instructions, but we recommend that you consult with qualified technician - all sales are final, no returns.