A couple of links for you:
My personal choice. I have owned two over the past 10 years, and they work great in all kinds of weather. My original one I gave to a Freeper who needed it for his own "good works," and I bought myself a replacement because I was so happy with the way it performed.
Thanks for the tip!
I lost my voice last time. Well worth it though.
your choice has a good price tag too.