Product review (3 stars): Great while it lasted
This item worked great for just a little over a year, it replaced a wired version that was in use for about 8 years.  The item is a 5 star gauge initially, the numbers are large and clear straight on and the outdoor transmitter was spot on with the indoor unit when placed side by side.  My problems arose at about the 12 month mark and all stems from the outdoor transmitter.  From the beginning I did not need to change the batteries to the outdoor transmitter till about the 8 month mark, which I thought was excellent.  Then the next time it wouldn't connect requiring a battery change was 4 months, then 2 months and here I am am now with the frequency being 1 week.  I did the reset as per the instructions before every battery change and that did not seem to help at all.
I will say also that my issue is not isolated as others who have seen my unit went out and purchased the same one here on Amazon and they too have experienced the same exact issues.  It was great while it lasted hence the 3 star review, just be aware that you will most likely need to replace it every year.  At under $20 that may be acceptable and seriously at this price point it is probably all you can expect..