This Electronic Start/Stop Work timer comes fully assembled in an ABS Plastic enclosure, with a 6 foot AC power cord to plug into an existing receptacle. Timer has numerous features, and allows for programming of up to 50 events. Add a horn from our options above, and you have everything you need to set up a start / stop work, lunch break horn in your plant or facility. The timer can be programmed for a number of events each day to turn the horn on and then off. The internal contact (switch) can be programmed from 1 to 15 seconds in duration (amount of time the horn will remain on). In a typical application, your horn (or horns) will be switched by the electronic timer at the predetermined "event" time, and sound the horn for 1 to 15 seconds depending on how it was programmed. This is ideal for break times, and lunch periods throughout the day. This system can have horns added to it as may be required to cover larger areas or noisy environments. Additional horns are simply daisy chained from the timer--continuing the 120 Volt AC power run begun at the timer. Additional horns can be purchased from the Audible Signals Category under the "HORN" product page, (i.e. Product Code 874-N5, etc). 120 volt AC input to the timer is accomplished with the included 6 foot AC power cord, or by the customer's hardwiring the AC power input. Please contact us if other audible devices are desired instead of the standard Vibrating Horn discussed here. This system will improve the timely dismissal of employees as well as their return to work. The 874 Horn is rated at 103db@10 feet, and mounts on a standard 4 inch square electrical box. Please contact us for more information.