Our 900 meter Wireless Warehouse Long Range 'S' Bell System is supplied with a Heavy Duty Push Button and a Loud Bell. It is popular in many applications, such as: Warehouses, Schools, Factories, Farms & Rural Businesses and Large Homes. The system includes a Plug in Signal Repeater which extends the signal from 900 metre to 1800 metre (line of sight), which can be extremely useful in Warehouses & Commercial buildings full of stock, walls & general obstructions. How it Works: The Heavy Duty Push Button (with 'Please Ring' etched onto it) is connected to a Long Range Battery Transmitter (fitted inside a easy to mount weatherproof box) by 3 metres of bell cable. The Push Button would be mounted onto the most appropriate location and the transmitter box would be located into the lost suitable location for wireless transmission (this could be simply on the back of a post or just inside a factory wall). The Receiver is powered by a plug in Transformer and has a built in chime (with adjustable volume), this is connected to a 85 Decibel Bell by 3 metres of cable, the Bell is fully weatherproof therefore can be fitted inside a Warehouse or in the Yard. When the Push Button is pressed, a Wireless Signal will be transmitted to the Signal Repeater (which can be within 900 metres (line of site) which will then relay the signal a further 900 metres (line of site) to the Receiver., Manufacturer: Ultra Secure Direct