This electric fence siren is easy to carry, clip on fence wire or tape, easy to operate, flashing light indicates low fence voltage. Made of high quality High-quality materials, safe, , not easy to damage, can be used for a long time. The electric fence alarm is exquisite in workmanship, waterproof and stable in performance, allowing you to use it with confidence. This electric fence alarm is mainly used to detect whether the electric fence voltage is normal, widely used in farms, outdoors, gardens. The electric fence voltage warning light is used in conjunction with the hoarding fence host, and can be used for various types of electric fences, including steel wire, poly ribbon, etc. Battery: 3V, 1 x CR2032 button battery (Battery Not Included) Color: Black Material: plastic Package Contents: 2pcs x Electric Fence Alert Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.