The gestation period is 21 (mouse) and 23 (rat) days. This explains the quick increase of population of these rodents in the places where the people they really can not wait. Previously, the main methods of combat with the hated rodents have been known to us chemical methods (poisoning bait, strong flavors, etc.), physical methods (traps, sealing holes and passages in the construction, demolition 'nests'), biological (use of natural predators – cats, dogs, etc.). An important discovery was the discovery of rodent aversion to powerful high frequency sound (ultrasound) who do not hear people. Application of ultrasonic repeller generates high-frequency waves and a large volume, which repeatedly reflected from various surfaces creates discomfort in the premises environment for rodents and forced them to leave the protected area of the device. The use of ultrasound repeller has several advantages: the device is harmless to humans and domestic animals is environmentally friendly because it does not use chemicals and other consumables; generates a constant changing sounds, so do not cause addiction in pests, easy to install, requires no maintenance, no effect on the work of televisions, computers and other electronic devices, can be used everywhere – in the residential, office, warehouses, garages, basements, lofts, factories, works silently, the result of the device seen within two weeks after starting use. When application of ultrasonic repeller must take into account the following considerations: ultrasound is reflected from all surfaces (obstacles). From solid surfaces (walls, ceilings) ultrasound is reflected better than from the soft (carpet, furniture) to achieve a result repeller must work continuously; in the characteristics of ultrasonic rodent repellents protected area is indicated for the empty spaces with concrete walls.
If the room has a high degree of congestion, the protected area is reduced by half. If the room has a strong degree of congestion, the protected area is reduced to three. Protected area also decreases, if the premises are items not reflect ultrasound (upholstered furniture, bags of goods, bales, etc.), usually from the premises where stored food, care of rodents may be delayed up to two months. In the absence of food, this period may be shortened to two weeks, all the ultrasonic rodent repellents should always work for two months. Further, devices can be turned off and include a week continuous operation of every month. Ultrasonic repellents are effective helpers rights when dealing with rodents.