North Star suggests that the purchaser retain the dated bill of sale as evidence of the date of purchase. This warranty is valid only if the serial number appears on the product. We test all products extensively before we deliver them to clients, and we ruggadize our products for the particular applications planned by clients. For example, North Star specifies that our 32 gram PTT will operate for 1,100 hours. In such a case, the PTT would probably not run for 1,100 hours.
North Star has no control over the electronics once they are applied to animals.