Received a 4 pack and had to order an extra sensor for a spare tire on a RAV4. During assembly, the rubber seal had to be removed from all sensors and reassembled correctly. They were just put on carelessly, luckily none of them were torn or torn. There was even a seal on the head. The specific sensors are not well known brands located in the sensor programming options of the professional proprietary TPMS tool but using a direct fit worked perfectly. The sensors correctly displayed tire pressure and temperature when programmed. It would be great if they had a choice of 4 and 5 packs. At least the lights are off.