How to Install Your Rodent Repellent

The ultrasonic rodent repeller keeps mice, rats, and martens away by creating a sound field that is unpleasant for them. It uses no poison, you do not have to empty traps, and no dead animal is left in the wall or between the insulation.

The three basic rules for effective installation: the device should be placed in the same open air space where the animal moves, the speaker should face the route it uses, and there should be no obstacle in the path of the ultrasonic sound.

1. Find out where the rodents are moving.

Do not simply place the repeller wherever there is a free power outlet. First, find the animals’ regularly used route and the possible entry point.

This may refer to:

• fresh droppings along walls or beams;
• chewed packaging, cables, or insulation;
• greasy, dirty marks along a frequently used route;
• an entry gap next to a pipe, cable, eaves, or roof joint;
• recurring nighttime scratching in the same area.

Turn the speaker along the length of the route or toward the entry point. In this way, the ultrasound does not end up in an empty corner, but directly protects the area the animals want to use.

2. Ensure a clear path for the ultrasound

The spread of ultrasound is most like the beam of a flashlight: it travels forward, and behind obstacles a shadowed area remains. Walls, ceilings, closed doors, thick insulation, furniture, and a packed pile of boxes all block it.

Therefore, the device:

• should not be placed behind a cabinet or pallet;
• should not face directly into a wall;
• should not be inside a sealed box or under insulation;
• should preferably radiate above furniture and stored items;
• should face directly toward the open area to be protected.

Ultrasound does not pass through walls, so every air space separated by a wall or a closed door requires a separate repellent point. A more powerful device covers a larger open area, but it does not replace the room behind a wall.

3. Choose a device suited to the size of the space

For a smaller pantry, garage, or single open room, the Basic version is suitable. For a larger attic, storage area, or workshop, choose the Pro version with higher volume.

If there is no power outlet near the installation point, use the built-in battery-powered Smart version. You do not need to place it according to the location of the mains socket, so it can be positioned exactly where it best covers the animals’ route. With a Wi-Fi connection, you can also monitor its operation remotely.

Do not try to reduce the number of devices at all costs; instead, cover the air spaces that need protection. A well-placed repeller in a large, open area is more effective than a device placed in the wrong spot in the middle of the whole house.

4. Keep it running continuously

The rodent repeller is not a device for occasional noise. It continuously maintains the sound field that the animals avoid.

For the mains-powered version, check that the power supply has not been unplugged. For a battery-powered device, monitor the charge level, and for the Smart version, use remote status monitoring. When switched on, the Vadalarm device indicates that it has started with an audible signal.

Do not switch off the device at night: it should be active precisely when mice and rats are most active.

5. Remove what draws them back in

The repeller drives rodents away from the protected area. Eliminating food, water, and easy-to-reach hiding places prevents them from trying to return again and again.

 

• Store food, pet food, and seeds in a sturdy, tightly sealed container.
• Do not leave pet food out overnight.
• Eliminate dripping water and standing water.
• Organize boxes and textiles that are moved only rarely.
• After the activity has stopped, seal entry points with a durable, chew-resistant material.

If you want to accurately assess which food sources attract them, read our guide on what rodents eat.

Placement in the attic and loft

In the attic, the device should not be placed next to the staircase or in a hidden corner of the loft just because there is a power outlet there. Place it in the open area where you have noticed chew marks, droppings, or regular movement.

Raise it above the obstructions caused by boxes and beams, and turn the speaker toward the used route and the entry point in the roof structure. In a segmented or wall-separated loft, each separate section should have its own coverage.

You can find a detailed attic guide here: rodent repellent in the attic and loft.

Placement in wall cavities and behind drywall

The ultrasound from a device placed in the room does not pass through drywall. In such cases, the repeller should be directed into an accessible wall cavity, an access opening, or the open route through which the animal exits.

Do not aim at the outer side of the wall; instead, cover the rodent’s actual air space or exit route. You can find the detailed solution in this article: driving rodents away from behind drywall.

Placement in garage, storage area, and workshop

In these places, shelves, pallets, and boxes usually create the most obstruction. Raise the repeller above the stored items, and point it toward the travel route running along the walls.

If the room is long or divided by multiple rows of shelves, use multiple repellent points. The goal is for the ultrasound to reach the entire used route, not just the few meters around the entrance.

Placement in the attic and near wall cavities

In the attic, beams, chimneys, boxes, and insulation materials can divide the space into several smaller sections. Look for a mounting point from which the speaker faces the area used based on the signs. Higher placement can help reduce obstruction from stored items, but make sure to also pay attention to the direction of the speaker.

A repeller operating in a living room cannot be expected to cover the cavity behind drywall. In the case of a wall cavity, the accessible opening and the animals’ exit route can serve as a starting point. In a cavity filled with insulation or divided into many sections, the path of the ultrasound remains obstructed.

You can find more advice on on-site solutions in our attic placement guide and in our article about rodents behind drywall.

Placement in garage and workshop

The arrangement of a garage changes even when parking: the car you pull in can block a previously clear route. Choose the repeller’s location based on the layout during normal use. Check whether the signal reaches the targeted area even next to shelves, stacks of tires, and the vehicle.

The airspace of the garage and the engine compartment of the car require different placement. In the path of a wall-mounted device, the car body and its panels can also act as an obstacle. If the damage occurs under the hood, install a car repeller there.

Installing AutoGuard in the engine compartment

The Vadalarm AutoGuard uses variable-frequency ultrasound and a flashing white light. Its built-in 2800 mAh battery can be charged via USB-C, so it can be used without connecting to the car’s electrical system.

Physical installation and secure fastening are required in every case. Look for a place where the device cannot move, and leave free space in front of the speaker and light signal. It must not touch moving parts, and it must not get pinched when the hood is closed.

Check the heat load as well. The AutoGuard’s specified operating temperature range is between –15 and +50 °C, so choose a spot where this can be maintained. When installed, a cold engine compartment can later heat up significantly. Also avoid places exposed to direct water spray.

With its own battery, in normal mode and under favorable conditions, up to 3 months of runtime can be achieved; in cold weather, more frequent charging may be necessary. If you want automatic car mode, the device can be connected to a 12 V vehicle battery with the included connector. When charging from the vehicle side stops, it stops charging, then after 3 minutes it alerts from its own battery.

You can find the details in our article about using AutoGuard without electrical wiring, as well as in our piece about martens appearing in the engine compartment.

Ensure power supply and check for signs

In a building, keep the repeller switched on and regularly check its power supply. For a battery-powered device, plan the charging as well: choose a mounting location that remains accessible for maintenance. In a car, check operation according to the selected mode.

Track changes based on fresh signs. Note where you found chewing damage or damaged insulation, and check those same points again later. Old damage remains even after the animal has left.

If new damage continues to appear, check the obstructions, the power supply, and any other possible entry route. If the activity persists, ask for on-site assistance; and have the car’s damaged wires and hoses repaired.

Organizing the surroundings is also part of the defense.

Keep food, seeds, and pet food in a tightly sealed, durable container. Eliminate water leaks, and reduce the hiding places available among cluttered piles of items.

Permanent sealing of the building’s entry points reduces the chance of new infestations. Before doing so, check that you are not trapping an animal or a nest inside. In a car, coordinate the sealing of openings and cable protection with a professional so that cooling and vehicle operation remain uninterrupted.

Quick check after installation

• The speaker faces the area used by the animals.
• You have checked the path of the signal even with the usual setup and parking position.
• The device is securely mounted and has proper power supply.
• The temperature and moisture exposure meet the device’s specifications.
• You can access it for charging, checking, and maintenance.

 

For buildings, take a look at Vadalarm rodent repellents, and for engine-compartment use, get to know the Vadalarm AutoGuard car marten and rodent repeller.

Choose a device suited to the place of use

When choosing for a building, base your decision on the size and layout of the room, as well as the available power source. Among Vadalarm rodent repellents for buildings, you will find a mains-powered Basic version and a higher-volume Pro version. The built-in battery-powered Smart version can also be placed away from a power outlet, and with a Wi-Fi connection, it can be monitored remotely.

For a car engine compartment, choose the Vadalarm AutoGuard. Its own battery and car connection option are designed for this use. For every device, check the suitability of the installation location based on the user manual.

Frequently asked questions

Is one device enough for the whole house?

The number of devices needed is determined by separate air spaces and obstructions. For multiple closed rooms, plan for separate repellent points.

How high should I mount the rodent repeller?

There is no universal height that applies to every location. Look for a point from which the space in front of the speaker is clear and the signal reaches the animals’ travel route.

Does a repeller operating in the garage also protect the engine compartment?

The bodywork and panels can block the engine compartment. If the problem is in the engine compartment, place the device intended for this purpose in the car, in the area to be protected.

Is it mandatory to connect the AutoGuard to the car battery?

You can also use it from its own battery. Proper placement in the engine compartment and secure fastening are still necessary in this case.