Small in size and light in weight, with a wired and waterproof design for convenience and durability. Multi-functions: the computer measures average speed, maximum speed, distance, and riding time to effectively track your cycling performance. After 300 seconds without signal input, the screen will enter standby mode with clock retention. When there is a signal input or any button is pressed, the device resumes from standby mode and retains previously recorded data. Powered by a LR1130 button battery (battery included). Color: Black Material: Plastic Package Contents: 1 x Bike Computer 1 x English Instruction Manual Note: Only the items listed above are included. Light reflection and differences in display screens may cause slight variations in color between the product image and the actual item. Measurement error allowance is +/- 1-3 cm.