SENNHEISER RS 45-8 Wireless RF Headphone System Center-Lock Auto Tuning - a touch of a button will automatically adjust to the transmitter (can be returned with a second touch if it locks onto your neighbor's transmitter!) Lightweight, cushioned headphones with spatial sound reproduction and powerful bass response Reception through walls and ceilings - in the home and outside Approx. 100 meter range 2 switchable channels for simultaneous operation of several systems