Doorbell echoer???

[trevmai]

I went to work last week and was given a job todo which said: Supply and fit Doorbell echoer for partially deaf tenant.
Have you heard of these before, all the wholesalers i use haven't. The only thing i've ever seen for deaf people is the flashing light when the doorbell rings.
Have you heard of this?

 

[THRIPSTER]

Say again?

 

[TicklyT]

The sheds stock some wireless doorbell kits that include a second battery powered sounder with a belt clip, so someone can carry it around with them.

Or something like http://www.deafequipment.co.uk/store/viewProduct.do?id=2588, which operates a pager.