It is a 2" Latch Hanger

Dimensions "The arm of the operator is 6" x 40"

providing ultimate coverage

10-30 VAC/DC low power fail-safe loop detector

So you can achieve quite the display with many feet of fence topped with solar post caps

Encrypted DIP Single-Button Remote Control 60CommercialGalvanizedChainLink It is a 2" LatchEncrypted DIP Single Button Remote Control Performance Ideal for applications such as gated communities or commercial applications requiring a large number of remotes for a common entrance Dual 12 position DIP programming offers up to 4,096 codes Narrow band transmission on 3 simultaneous frequencies (310, 315, 390 MHz) Compatible only with Security+ 2. 0 commercial receivers and operators Safety and Security Encrypted DIP style single button remote