[Trevor]

"Spehro Pefhany" wrote in message
...
On Thu, 07 Mar 2013 12:49:27 +1000, the renowned Adrian Jansen
wrote:
For an example, the tyre pressure monitor systems at 433 MHz. 10 gram
package, including battery, you screw on a tyre valve. Monitors tyre
pressure and temperature for about 1-2 years of operation. Reports real
time, every minute or so, to in-car readout.

Frequently fails mechanically, causing loss of tire pressure, allows
tire shops to charge for a "rebuild kit" whenever they swap a tire,
requires a trip to the dealer (or specialized equipment/knowledge) to
replace, even with an OEM replacement part.. other than that, they're
just spiffy.

So pretty much like many of the new gadgets on modern cars, something else
to go wrong that costs you money, even if you never wanted it in the first
place :-(

Trevor.