Review on GARNECK Pressure Anti Theft Indicator Motorcycles by Ryan Frawley

I don't know what to do with it. I know I should replace the tire cap with them, but my front and rear wheels have different pressures. How does he know what pressure is right for that tire? There are check boxes for different pressures on the back of the canister, but none of them are checked. The instructions are minimal and I don't understand how he can measure the pressure without deflating the tire. At least a bit. Right now they're just sitting on my desk while I decide whether to really try them or just write them off as a bad buy.