An electronic deer repellent is a scare-type deterrent for deer that wander into the yard. It emits a loud sound and may include visual effects and motion detection. Deer get the message, running from the area to escape the stimulants. This type of deer deterrent has both positive and negative aspects that should be considered before making a purchase.
Some consumers report that electronic deer repellents are effective only for the short-term. Deer sometimes become used to them and may even learn their range. When they realize that no harm comes from these devices, deer may simply ignore them. Even when a device changes sound frequency periodically, deer can become accustomed to it.
A motion-activated device that sprays water is branded under the name Scarecrow. This repellent can be effective because a deer will never enjoy the spray. Other repellents considered “scarecrow” type deterrents feature sound, visual effects, and motion. An auditory repellent that emits a loud sound is not suitable for a residential or suburban area because it will disturb neighbors.
Motion detecting devices sometimes activate a radio but the loud volume can also cause disturbance. Devices that emit high-frequency sounds are sometimes motion-activated. These sounds do not violate noise ordinances and may not be heard by the human ear but deer may become accustomed to them. Strobe or flashing lights are included in some motion-activating devices and these should be used away from the line of sight of neighbors.
Balloons filled with helium are featured in some visual deer repellents. These move when motion is detected or periodically according to a timer. Though they can be effective, they can also be an eyesore in the yard. This is often not an issue for a large property because the electronic deer repellent can be placed around the property border so it is not immediately seen.