The SmartHalo 2 Smart Bike Cycling System is a sleek and modern bike computer designed for cyclists looking for convenience and security. With its GPS sensor and alarm feature, riders can navigate with ease while ensuring their bike stays safe. The device is compact, measuring 3 inches in length, 2 inches in height, and 1 inch in width, making it easy to attach to the bike frame. Powered by batteries, the SmartHalo 2 also provides heart rate monitoring and operates on iOS for seamless connectivity. This innovative technology from Smarthalo 2 is a must-have for cycling enthusiasts. THIS IS MISSING ITS KEY AND IS ONLY THE HALO AND THE BOX.