My first device had a defective sensor. The company shipped a brand new device within 2 days and it works as advertised. The device comes with an adhesive backing rather than a non-adhesive one like some others, which is a minor inconvenience. The sensors were immediately connected and reading the pressure. First we turn on the receiver, then we attach the sensors one by one, wait for the pressure to appear, then everything is fine. It is best to hold the receiver in your hand while installing the sensors to ensure they register. Appears to be accurate to within 2 pounds.