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The Multi-Code 3022 is remarkably easy to install and simple to program, which makes it the perfect choice when you need something for the safety edges on gates and large commercial doors. It's designed to be used where hard wires are impractical, and it's more economical than coil and cord sets. Powered by a 9-volt battery, the Multi-Code 3022 gives you the added level of protection that only 1,024 possible codes set by DIP switches can provide. Measuring 4 inches wide and 4.28 inches high, this 2.22-inch thick transmitter is the smart choice of businesses, retailers and homeowners with security gates.