1 Place the cotton balls in areas where mice are likely to enter your house, by doorways or heat vents, etc. 2  Another helpful deterrent is to grow peppermint plants near the entryways. 3  You can use the mint in cooking as well as it serving a deterrent purpose.
Nov 12, 2015. 20 kilometers (12 miles) for a 1 milliwatt beam. Laser light can travel 20 kilometers (12 miles) per-milliwatt that is contained within the laser.
Laser radiation may be emitted in the visible portion of the electromagnetic spectrum, wavelengths of 0.4  m and 0.7  m, or in the invisible infrared and ultraviolet regions. Laser radiation transmits energy which, when a laser beam strike matter, can be transmitted, absorbed, or reflected.