Cleer Flow Noise-Canceling Wireless Over-Ear Headphones (Silver/Black). Flow Noise-Canceling Wireless Over-Ear Headphones from Cleer can make for an ideal set of headphones. They utilize a combination of active noise cancellation and passive noise isolation to filter out ambient sounds. They can reduce wideband sound by up to 30 dB. If you do need to hear others or the world around you, simply engage Ambient Mode via the dedicated button on the Flow's integrated earcup controls. It's a convenient feature to deal with mass transit announcements, placing an order, or having a quick conversation without having to remove your headphones.