Cables Unlimited SPK9110 900MHz Modern Wireless Stereo Headphones Audio Unlimited's wireless headphones allow you to listen to music just about anywhere without the hassle of cumbersome wires. The powerful transmitter uses 900 MHz technology to send music through walls and floors to the wireless headphones up to 150 feet away. These comfortable highquality, lightweight, over the ear headphones provide the perfect solution for watching movies or listening to music without disturbing your family or roommates.