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.
1 The U.S. limit for a laser to be sold as a pointer is 5 mW (0.005 watt). 2  The new lasers are 400 times more powerful than a âlegalâ laser pointer. 3  The infamous Wicked Laser Spyder III Arctic is nominally a 1000 mW laser (1 watt).