Well I put them on my snow tires in May and when it finally came time to put snow tires on in November only 2 out of 4 registered a signal. 2 are dead. Be aware and check your sensors for a signal as soon as possible. UPDATE: I contacted the seller and he sent a full replacement kit for free. I really appreciate it and will replace tuem as soon as possible. EDIT: The new ones worked great. Thanks again.