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 powers and visibility. The power of a laser beam is measured in watts and milliwatts (1/1000 watt). The minimum power needed for a laser light show in a dark, medium-sized room (like a hotel ballroom) is about 500 milliwatts to 1 watt. Somewhere between 5 and 20 watts is typical for indoor use.