Get rid of mice from your home/ at work using this extreme repellent sound. This is a lot more powerful (wider frequency range) than the first version so that the sound would penatrate through any kind of walls and ceilings. If you play the sound continuously in the place where mice appear often, they will disappear and never come back. Use an old cell phone to play it all the time. Using good speakers will make you get a better result. However, the results may vary depending on the cell phone and the speaker model. Set the volume between 20~40%.