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Test ultrasonic pest repeller

This is an abbreviated report on the repelling effect of pulsed ultrasound on laboratory mice using a sound attenuating baffle chamber performed at Bio-Acoustical Laboratories Inc., Dallas, Texas, U.S.A. July 1983.

Ten mice were placed in the experiment, with half the population on either end, i.e., in each choice box. Observations were taken every six (6) hours for seven (7) days without any ultrasound stimulus.
This provided for an adequate control group study in order for a proper analysis of variance and multiple t-test for statistical analysis. This also allowed the subjects to adequately accommodate to the environment.


At the end of the control group data collection, the ultrasound stimulus was begun and half the population again placed in each choice box. Again observations were made every six hours for a full week.


Observations were made in numbers of subjects in each of the data sections A, B, C, D, E and E. Proper attention was placed on humidity, temperature food and water sources. These environmental factors were maintained as steadily as possible to allow for proper experimentation, testing only the one variance in environment, that being the presence or absence of an ultrasound stimulus.

In every section (A-E) there are identical food and water stations. The ultrasonic energy attenuating baffles were placed in sections B, C & D at even distances according to sketch above. An ultrasonic pest device branded El Mar 300D was installed in section A.

As can be seen from the first table from the first week (Dag 1-7) without ultrasound the mice move completely randomly between the different sections.

Evaluating the second table containing data from the second week (Dag 8-14) with ultrasonic sound one can see that all subjects within a few days tend to have moved to the sections D and E, with the centre of gravity in section D.


It is with this experiment difficult to make any firm conclusion as to the fact that the mice prefer section D in favour of E. One feasible theory though could be that mice under stress tends to seek protection in narrow spaces, the more narrow the better.

Final statement

This type of ultrasonic pest repeller did show statistically significant repelling effect. Mice show avoidance behaviour rapidly. This avoidance was seen both in terms of where the population was during the observation periods and via activity monitors such as water consumption.

James P. Humphries, B.S., D.V.M.

Primary Investigator

Bio-Acoustical Laboratories Inc., 9550 Forest Lane Suite 330, Dallas, Texas 75243, tel. 214 343-4420

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