Well I have the GB-501 PG2 glass break detector and although it is tuned to the frequencies normally associated with breaking glass I can tell you it does sense other impacts such as me dropping objects on a wooden table near the sensor and the LED even flickers when I release my tablets from their packaging!
It seems to respond to shorter, sharper dynamic sounds so I wouldn't recommend it for wooden walls...maybe this is what you need when it is released;
I wouldn't hold my breath though...I have been waiting for the IP Module & Tower-20AM PG2 outside sensor since the PowerMaster range was released and the latest news I have is April/May 2013
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