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Used Acoustic Research AW-721 Wireless Headphones for sale. Download My Box Chevy. Pair of wireless stereo headphones with transmitter for indoor or outdoor use 900 MHz frequency transmits at distances of up to 300 feet RF noise reduction system reduces interference for high-quality sound Transmitter doubles as charging base; self-adjusting headband and cushioned ear cups The Acoustic Research AW721 wireless stereo headphones feature the company's patented 900 MHz wireless technology, which transmits signals through walls, floors, and ceilings at distances of up to 300 feet. The transmitter sits inside or outside the house, and no line of sight is required between the headphones and the transmitter, giving wearers the freedom to move around.