The Arccos Caddie Gen 4 Smart Sensors are a set of 16 tracking sensors designed for golf enthusiasts. These black plastic sensors are powered by batteries and provide distance measurements in both decimal and imperial units. With features like lightweight design, strokes gained insights, personal AI caddie advice, and a water-resistant GPS rangefinder, these smart sensors are a valuable tool for improving your golf game. Made by Arccos Caddie, a reputable brand in the golf tech industry, these sensors offer accurate and reliable tracking for golfers looking to enhance their performance on the course.