Sigma Sport Bike Speedometer Waterproof Wireless Bicycle Bike Computer and Cycling Odometer with Automatic Wake-up Multi-Function LCD Backlight Display Bicycle Computer/Front and Rear Safety Light Combo Pack 5 Function Bicycle Speedometer (Current speed, trip distance, ride time, clock, total odometer) Front white LED safety light with flashing and constant mode, Includes O-ring + 2 Velcro straps for unlimited mounting options Rear red LED safety light with flashing and constant mode, Includes O-ring + 2 Velcro straps for unlimited mounting options Toll free battery change, tool free installation, weather proof