Watch your score get lower the more you play! Sensors record every shot and provided real time on site decision making. Over time, players will have the exact distances each club travels and where there is room for improvement. This Cobra Connect 8 pack was received as a DEMO package but has not been used. Sensors work with all brands of clubs and club types. Package consists of (7) club sensors and (1) putter sensor. Users must download the Arccos App on their smart device. Batteries are installed and included.