Motion detectors are not on all mechanical deer repellents, but they can make all the difference on whether of not the repellent will be effective. Some people even make their own motion sensors or buy commercially available sensors and add them to their own controllers.

There are two products that stand out when we talk about deer controls with sensors that spray water.

The Orbit 62100 Yard Enforcer Motion-Activated Sprinkler

The only deterrent sprinkler on the market with options for day only, night only, or 24 hour protection, giving you the flexibility to ensure the Yard Enforcer only activates when you need it.  It has optimum water and battery conservation; get over 7,500 activation cycles on just 4 AA alkaline batteries and as little as 2 cups of water per activation. The Yard Enforcer is a motion-activated sprinkler that combines sound, water, and motion. It passive infrared motion sensor that detects animals from up to 40 feet away, even at night, to give you maximum protection, and its intelligent sensing technology learns the difference between animals and tree limbs blowing in the wind to prevent overwatering.  Unlike some other water repellers, the dual-purpose sprinkler has a timed watering feature that allows you to water your garden 30 minutes at a time



The Havahart 5277 Critter Ridder Motion Activated Animal Repellent and Sprinkler

 This motion-activated sprinkler attaches to the garden hose. Just hook it up to your garden hose, plug in the 9-Volt battery and then place the stake in the ground near area to be protected. When an animal is seen, a valve opens, and instantly releases a three-second pulsating spray of water. The combination of the sudden noise, movement, and water
frightens animals away. It is a clean alternative to repellant, but is limited to the distance the water can spray. Both a pro and con is that it is motion activated sensing motion and
heat the same way security lights work.  This motion could be deer, your dog or cat, or you. One Havaheart can cover up to 1,000 square feet.
This motion-activated sprinkler attaches to the garden hose. Just hook it up to your garden hose, plug in the 9-Volt battery and then place the stake in the ground near area to be protected. When an animal is seen, a valve opens, and instantly releases  a three-second pulsating spray of water. The combination of the sudden noise, movement, and water
frightens animals away. It is a clean alternative to repellant, but is limited to the distance the water can spray. Both a pro and con is that it is motion activated sensing motion and
heat the same way security lights work.  This motion could be deer, your dog or cat, or you. One Havaheart water controller can cover up to 1,000 square feet.  The motion-activated repellent uses only 2-3 cups of water per spray, making it economical and environmentally conscious
Havaheart Water Repeller Set Up
Connect all four pieces of the unit by screwing them together. Then insert 2 AA batteries (not included) into the battery compartment. Turn the sensitivity knob to setting 4. Move hand across the sensor until the valve clicks. You will hear another click approximately 5 seconds later. Once the valve clicks the second time, the unit is working properly. Stake the unit into the ground wherever you’d like to repel animals and adjust the range as necessary. Attach a standard garden hose to the connector. Test the device to make sure the sensor detects your movement at the selected range.
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