If you’ve ever lived in a large apartment building or condominium, then noisy neighbors are just a part of everyday life, but some residents in South Korea are dealing hitting back, literally. There are companies that specialize in custom wall-mounted sound machines, called “revenge sound speakers”, that can be paired with a smartphone or tablet to play media. While there are various models, the most popular one at the moment sets you back approximately $150 USD.

In other words, these are just standard speakers capable of being mounted on a wall or ceiling that can play music or any sound you like when paired with a compatible device. Should you not live in South Korea, the sales listing below shows you some of the parts needed to make your own. Or, simply contact the neighbor or landlord to get things resolved should all else fail.