I spent £200 on an alarm that is supposed to detect THC/cannabis smoke Although the smoke is so bad in the room at this very moment, being Saturday night and therefore drug addicts are in the middle of a session, the alarm is silent. What a complete waste of money. What a joke of a product. The instruction leaflet was also translated from Chinese and makes no literal sense. I might have shrugged my shoulders if the product was £20, but £200! I'm so angry about this