Mobile phones are useful because we can use them in a lot of different ways, specially the new ones.
Laptops can be very important equipment in our hands because they help us do a lot of different things in work and knowledge.
Fax machine is very helpful because of it's ability to send documents in real time.
Satellite dish means a lot for people entertainment these days.
Every electrical equipment has a remote control in order to operate. Remote controls have been very important in our daily routine.