Dennis,
I have the same unit - Dig 9001DB - that Sal posted. I have owned it since 2008.
Good unit. My only issue occurred about 18 months ago. After realizing that I needed to replace the battery, I noticed that the plastic clip/hinge on the battery door was broken. While replacing the battery, I saw that the terminal (+/-) connector was rusted due to water entry from the broken battery door. After a few bucks, new connector, wire splicing, and super glue, I haven't had any more problems with it.
JD