None.

Let me think:

 

1. TV

2. DVD player

3. VCR player

4. air conditioner

5. Ventilation fan (or however to say it)

6. HI-FI pt. 1

7. HI-FI pt. 2

8. digital receiver for TV :D

 

I think that's everything :D nice topic hehe

I have 4 (DVD, VHS, Tv and for the "digitalbox", don't know the english word for that one) I use all of them. All of the movies we have are on VHS so we use that a lot.

um....6. Ones that do not work does not exist anymore.