So what’s wrong with listening for the phone ringer or looking at the fax machine’s "out" tray? If you work at home you need to be able to respond to phone calls or faxes as soon as they come in but you cannot be hovering over the phone all day; there are times when you have to leave your office or home and if you do not physically lift the phone handset and listen (if you have Messagebank) or check the fax as soon as you arrive back, calls or faxes could be without a response for some time.

Or maybe you have an office but spend some time in the workshop. Same problem – or even more so if you are waiting on an important call or fax.

So this is the remedy. Build this device and it will let you know that a phone call has been made or a fax has been received, without you needing to actually check the phone or fax.