Gallagher 1-1/2 In. W. x 5 In. H. x 1 In. D. Permanent Electric Fence Tester

Permanent electric fence indicator that flashes when electric fence is live. Visible from 3000-feet at night. Low voltage cut off, will not flash if the fence voltage is too low. Place earth stake in the ground and clip device onto fence wire or tape. Water and ultra violet resistant. No batteries required.