MouseBlocker 12V Ultrasonic Under-Hood Rodent Deterrent — Compact, Low-Power (85 dB)

MouseBlocker 12V Ultrasonic Under Hood Deterrent is a compact, battery-powered device that emits a loud ultrasonic pulse beneath the hood to discourage rodents from nesting and chewing on vehicle wiring and components.

If mice, rats or other small rodents are finding their way into engine bays, they can cause costly damage to wiring, hoses and sensors. The MouseBlocker installs directly to a 12V battery source under the hood and continuously broadcasts an ultrasonic pattern designed to create an unpleasant environment for rodents without using poisons, traps or ongoing maintenance.

How does the MouseBlocker stop rodents under the hood?

The unit generates an 85-decibel ultrasonic tone at frequencies selected to be particularly irritating to rodents, making the engine compartment uncomfortable for nesting or chewing. Because it is mounted inside the engine area, the sound focuses where rodents most often build nests.

• Continuous ultrasonic pulses around engine components.
• Decibel level and frequencies tuned to deter small mammals.
• Placement under hood targets common nesting spaces.

Is the 12V installation difficult and will it drain my battery?

Installation is deliberately simple: the MouseBlocker connects with two wires directly to the vehicle battery, so there are no remote batteries to replace. It draws only 0.1 watts, meaning it runs constantly with negligible impact on battery charge.

• Direct two-wire hookup to 12V battery under hood.
• Extremely low power draw (0.1 W) for long-term use.
• No periodic battery swaps or corroded contacts to worry about.

Will this work on my type of vehicle and in extreme weather?

MouseBlocker is designed for broad compatibility with any vehicle or equipment that has a 12V power source, including cars, trucks, motorcycles, snowmobiles, ATVs, boats and farm machinery. The device is built to tolerate high engine temperatures, cold climates and damp conditions.

• Compatible with cars, trucks, motorcycles, RVs, boats, tractors and more.
• Rated to withstand hot under-hood environments and subzero temperatures.
• Resistant to moisture so it performs in damp or humid conditions.

What maintenance or professional standards support the product?

MouseBlocker is compact—about the size of a deck of cards—and engineered for long-term, hands-off protection. It’s used by many dealerships and repair shops across North America as a preventative measure that avoids the need for repeated interventions.

• Professional-grade design trusted by auto dealers and repair shops.
• Low-maintenance operation after a one-time installation.
• Small footprint that fits into most engine compartments without obstruction.

Who is this for? If you own or service vehicles, seasonal equipment, or recreational machines that sit unused for days or weeks—especially in areas with rodent activity—MouseBlocker offers a simple, low-power solution to reduce the risk of chewed wiring, nests and related repair bills. It suits DIY installers, fleet managers, dealerships and hobbyists who want preventive protection without poisons, traps or frequent maintenance.