It was one of the 1st. extra thing I bought after buying my PB820D. Worked pretty good with my pit out in the garage, 35 paces from the house. But got tired of the alarm not working. And to make thing even worse the darn barn cats ate the end off one of the probes. I don't need anything fancy since I only do one or two pieces of meat at a time being empty nesters. After following an ad-link I settled for a Therm-Pro 20, that's all I need. Really like the knurling on the meat probes. Spent yesterday playing with it and found out that there a plus 12-15* difference in grill temp from left to right in my 32" barrel. The alarms are good and loud BUT the advertised 300ft range is only good for line-of-sight. Over all it's going to do everything I need it to do. FYI.