The arc wrapping design is comfortable and humanized, the butterfly buckle design is convenient for disassembly and assembly, the USB fast charging is worry-free for riding, the raised button design is convenient for quick operation, and the universal fit is convenient for travel. Powerful functions make travel more convenient, and mobile phone Bluetooth interconnection unlocks all functions. Installation steps: Step 1: Put one end of the round hole of the bracket into the pre-installed pole and tighten the screw with a screwdriver; Step 2: Align the buckle on the back of the instrument with the bracket opening and rotate clockwise. Functions: bluetooth navigation dynamic effect, positioning information dynamic effect, weather information dynamic effect, instant communication, incoming call contacts, power information dynamic effect, sports information, health information.Basic Information:Memory capacity: running memory: 64MData connection: Bluetooth: Bluetooth 4.2Endurance and battery: battery capacity: 2000mA;Input voltage: 5V; charging interface: Micro USB; battery life: about 6 hoursCPU: SSD201_DS_V04Operating system: Siqi smart stopwatch operating system