This motion sensor does what it's supposed to do, but personally I find it too sensitive and sometimes even rapid changes in lighting (e.g. the reflection of passing clouds. Another thing that there are too many melody options (in the high 20's and low 30's) I'm sure you'll find one you enjoy listening to k.I use two different sound systems to monitor two different approaches.louder and louder.Overall this is a good buy and very practical.
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