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.
Dangerous: This Â£185 laser has a range of 85 miles. Green laser light is 20 times brighter than blue light to the human eye, hence the Krypton's enormous range. The lasers are also powerful enough to set fire to paper and matches - and have a built-in microprocessor that stops the laser itself overheating.