Easy to Use: Replaceable CR2032 included , works with all energizers,the item is not intended to flash when the fence is operating properly. Multiple Function: LED Light Indicator Alert can be used on any type of electric fence including steel or aluminum wire and on portable poly products. Durable Materials: The electric fence indicator is made of ABS plastic and copper material, which is safe and durable, not easy to be and can be used for a long time. Quick and Easy Installation: Simply clip the indicator onto the fence and flip the switch to use it, waterproof and stable. High Visibility LED Lights: Flashing lights indicate a malfunctioning fence and are easy to see during the day and at night. Install line indicators in important locations such as driveways for easy viewing. Color: Green Material: ABS Package Contents: 1 * fence alarm