Earplugs are handy for blocking out unwanted noises, but if you want still to hear a bit of it you will need the plugs with volume button. In the case the Knops comes to help, its is the earplugs with adjustable volume control. They are a purely mechanical device, with no batteries required. They are stickable to the ears and adjustable dial to on of four steps:
- It has no sound-blocking effect, allowing you to hear everything.
- Is designed to reduce city noise,
- Is intended to reduce the volume of live music,
- Is made to block all but the loudest of noises completely.
Sound hole farther and farther around, aligns with an increasing number of acoustic filters with each step. Knops is currently crowdfunding on Indiegogo and shipping is estimated for November, if all goes according to plans.