Travelite HS-1000W

I bought two of these headsets and we use them close together and they work flawlessly with each other, no "cross over" between our headsets.
But there is a very great weakness of the headset and it is spreading between the headset and the USB receiver.
For example. , the difficult to send through the wood (about 1 meter thick), and through more than a wall thickness of 10 cm and is too far away (more than 10 to 15 meters, it is necessary that you turn the transmitter against which the recipient is otherwise you will lose signal.
I have tested the headset both inside and out, and the result is the same.
One would hope that ASUS would put an amplifier sends the next generation of wireless headsets.