Bicycle Computer Intelligent Induction FSTN Screen Speedometer IPX5 Waterproof for Cycling Item Type: Bike Computer Material: Plastic Computer Battery: Built-in a CR2032 button battery, capacity: 150MAH (included) Wireless Probe Battery: Built-in a CR2032 button battery, capacity: 150MAH (included) Waterproof Rating: IPX5 (Anti-domestic water and rainwater) Weight: Approx. 90g / 3.2oz Product Size: Approx. 6.5x5x2cm / 2.6x2.0x0.8in Basic Functions: Clock display (CLOCK), stopwatch mode (STOPWATCH), riding distance (TRIP DIST), riding time (RIDE TIME), maximum riding speed (MAX SPEED), average riding speed (AVG SPEED), distance Display (TRIP UP), calories (CALORIE), total riding distance (TOT DIST), total riding time TOT-TIME), memory storage function (MEMORY), automatic cycle scan display function (SCAN) How e: 1. Use a coin (not included) to open the computer and wireless probe according to the operating instructions on the product, and remove the insulating sheet inside 2. In any mode, press and hold the "M" + "S" keys at the same time to activate the backlight mode 3. Press any key in the backlight mode, the backlight will be on for 3 seconds to turn on the backlight mode (LIGHT ON) 4. Turn off the backlight mode (LIGHT OFF). 5. Non-exercise state, automatic sleep, power saving sleep state, press any key, automatically turn on the product built-in vibration switch, when riding, it will automatically turn on when vibration is detected