I've had good experiences with this product too. I have a Dubro kwik charge switch on one of my planes and on one trip to the field, I had to swerve pretty shraply to avoid an accident. Needless to say, the poor plane at the back of my car was flung onto its side and caused the switch to be pushed into the on position. The batt was draining all the way to the field and lucky for me, I noticed that the voltwatch only had one green LED on by the time I had the plane ready for flight. However, on very bright days, it can be a little difficult to see so its best to cup your hands over it to give it some shade.

I believe they have a similar gizmo with an "alarm" feature that sounds when the plane crashes or when signal is lost? Anyone knows what its called?