1) It's not strictly necessary to have "line-of-sight between sensor [sic] and receiver" if there are adequade surfaces to reflect the IR beam. I used to have an IR sender-receiver contraption to plug into the centronic ports in my PC and my printer that actually worked quite well. (Still have it boxed up somewhere in fact, if somebody is interested?)
2) In theory, could I release trained bats from my secret underground lair to mess up the Chirp systems with their ultrasound shrieks?
Biting the hand that feeds IT
