I have one of
THESE
It's a Prosignal that I bought from Farnell about 18 months ago and is still going strong. Previously, I had a Youshiko, but I don't recommend those as the anemometer used a reed switch to trigger the system and I think that is dopey as it is mechanical and isn't going to last long -- it didn't, it lasted about seven months and when I contacted the distributor about getting it fixed, they denied that I'd ever bought it from them (I can assure you, I did). That went in the bin.
The Prosignal, as far as I can tell, uses a magnet system for the anemometer which is far more reliable. The only thing I've had to do (and they recommend doing this anyway, once a year) was clear the rain gauge as a seed, exactly the right size to block the hole, had fallen in and turned the gauge into a mere bucket. My receiver is behind a one foot thick wall and is about fifty meters from the sender unit, I have had no connection problems. I've only changed the batteries in the sender once and that was not because they failed, but because of the aforementioned seed blockage and I thought I might as well since I'd taken it down. Using a battery checker on the removed batteries revealed almost no reduction in power and that was after about 10 months of use.
You can connect it to the internet if you really want to but I only wanted it for my personal use so never bothered.
Hope that helps.
Edit: I've just looked at the one seaodyssey mentioned and I can't see any difference between that one and the one I bought apart from the vastly different price. Perhaps there is a difference I can't see.