Yes, you can use a maximum of two SHD9100 sets at the time in one room. However, each of the headphones can only link to their own base unit/transmitter. How to setup: * Place transmitters at a distance of 2mtrs. or more * Switch on the set of headphones near its own transmitter (see user manual for normal setup) Hints: When you are outside the physical wireless range and the music is interrupted, just return to the base unit/transmitter and the link will automatically be re-established. When both headphones are out of range and the music is cut off, it might occur that while approaching the base unit(s) again, you are temporarily connected to the other base unit. As soon as you are within range of your own base unit, you will be automatically switched to your own music source. This is normal.