1. This product is installed in an area with dogs, the detection range is more than 15 meters, and the hanging height is not more than 1.5 meters. It can be placed on trees, hung on poles and fence posts. In order to achieve the best results, the area where this product is used should be an open area without large obstacles. This product uses ultrasound to prevent unnecessary barking of dogs. 2. The product has a total of 4 gear functions: OFF: Used to save battery power and extend battery life. Test: Used to check whether the microphone and speaker are functioning normally. Level 1: Detection range of 5 meters 2nd gear: 10 meters detection range 3 gears: 15 meters detection range. 3. The product uses a 9V battery (not included in the shipment), and the detection mode is the switch from OFF to the TEST position. 4. Blow or make a sound into the microphone at close range, the ultrasonic transmitter will beep 3 beeps, and the LED light will be on 3 times at the same time. It means that the product is functioning normally. 5. Material: ABS
