Schrader AirAware 20256 TPMS Wireless Retrofit Kit Review

I was looking for a system to monitor tires on my truck and RV trailer both. This one does not do that! First one I bought used external sensors and had capability to monitor up 22 tires, though it only came with 6, which was enough to monitor the 6 tires on my trailer. I didn't like the look of the external sensors; particularly on the truck, so for about what it was going to cost me to buy the additional 4 sensors to monitor my truck as well, I found thissystem Schrader AirAware 20256 TPMS Wireless Retrofit Kit, which used internal sensors and decided to try it in addition to what I'd already bought.

Pros:
Sensors are internally mounted; no big ugly external sensor screwed on the end of the valve stem in place of a valve cap like other kits offer.
You can adjust tire pressures without having to remove sensors like the screw on type sensors require.
Monitors both pressure and temperature of the tires.
Pretty easy to set up (sensor learning process) plus built in functionality to handle tire rotation later on without having to relearn.
Power management; both the sensors and recievers power down after periods of inactivity and resume when they sense motion (vibration).
Reasonably priced.

Cons:
Only monitors 5 tires max.
Not recommended for trailer use (range issues?).
Though the unit is constantly monitoring each wheel, the display does not automatically rotate and display status of each tire. You can manually scroll and view a specific tire though, and when (if) it does sense a problem, it does automatically switch to and display the status of the tire of concern.
The alarm is not very loud, hard for me to hear over my diesel rattle. It does flash a visual indication when there is an alert.
Tires have to be broken down to access sensors (as is the case with any internal type).

So far I've been real pleased with the unit and peace of mind it provides me when traveling, and having separate system for truck and trailer has been alright too, when I disconnect trailer, I can just turn off or leave at home the monitor for the trailer; a single unit would require me to reprogram if trailer was there or not (as they also alert if theres no communication from a programmed wheel).

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Product Description:
The Schrader AirAware TPMS Retrofit Kit is a battery operated (two AA batteries included) wireless kit that can be installed on vehicles not equipped with original-equipment systems. The stand-alone kits include a dash-mounted receiver display, four wheel-mounted transmitters that fit most wheel applications and installation instructions. The retro fit kit will continually monitor tire pressure and tire temperature in all four wheels and alert the drive with an audible warning at under-inflation of 25 percent or more. Monitoring of proper tire pressure will maintain vehicle performance and support safety as well as improve vehicle handling, reduce braking distances, lower the risk of hydroplaning, decrease tire wear, and improve fuel efficiency.

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