Repel Mosquitos, Dogs, & Annoying Friends with High-Frequency Tones on Android « Android Gadget Hacks Repel Mosquitos, Dogs, & Annoying Friends with High-Frequency Tones on Android There are few sounds that actually make me cringe whenever I hear them: silverware scraping on a plate, nails scratching on a chalkboard, and piercing high-frequency tones. While the former two terrors require some physical hardware, sending out high-frequency sounds is as easy as downloading an app. Of course, since high-frequency sounds are terrible things to hear, this app is great for classroom and office pranks, or quite possibly fending off dogs and bugs. Try this at your own peril (I suggest using earbuds or earplugs).
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Fake TV - Burglar Deterrent I was shopping around on Amazon the other day and came across a product that I thought was genius. It is called Fake TV and it acts as a burglar deterrent while you are away from the house. At night, the Fake TV turns on and uses a series of LEDs to project random colors that looks as though someone is inside watching TV when viewed through curtains or shades. There are some videos of it in action on YouTube and I have to say it really does look like someone is inside watching TV. This should scare off the large majority of petty thieves that are just looking for the quick opportunity. If someone is casing your house, this probably isn't going to help you though.
Batch Change/Rename File Extensions In Windows Do you want to batch rename file extensions in one simple step? Changing each file extension separately can be a pain in some cases where you have to change extensions of more than 100 files. There are two methods of changing batch file extensions quickly. Method 1: Command Line Select the folder which has all the files who’s extension you would like to change. As an example I have made a folder named “test”, inside this folder I have placed four images in .jpg format.