I tested the unit behind the couch and even worked there

The Unit has a higher frequency volume augmentation built-in which makes people with high frequency deficiency (can't hear high tones with speach or music) enjoy their audio sounds

This is a worthwhile unit to have, especially for seniors who are gradually becoming a bit hard of hearing.

But other then that, it is a perfect unit that works wonderfully for him with his hearing loss.

Would highly recommend this unit.

The units will static if there are objects blocking the line-of-sight between the transmitter and receivers.