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The Flash 2000 flashes with each impulse when the input energy in the fence exceeds 2000v. It will cease to flash below that level giving an indication that the fence needs to be looked at and repaired.
A very useful optical function at night and dusk. Simply clip the Flash 2000 onto the fence and it begins - no earth is required.
Includes a lithium button cell. If it is constantly flashing this battery will last about 6-8 weeks