With the knapsack as the carrier, the product utilizes Bluetooth technology to realize the communication between the head control end and knapsack steering indicator. Meanwhile, the head control end is dismountable. After the tour pal gets off the bicycle, the head control end can be still bound on the arm for using continuously. GPS positioning is also embedded in the system. Its specific functions include: steering indication of bicycle, head lamp, ambient temperature and humidity detection and GPS positioning.