Power Switch Built for super dark lighting conditions Hope have incorporated a backlit LED power button. This makes finding and using the power button in the dark easier than ever. You can use the button to toggle through different power modes dependent on your battery life or current environment’s lighting conditions. Mounting System The R4+ comes with an integrated mounting system. Included with the light is three different forms of attachment: handlebar mount, helmet mount and head harness. This allows you to use the light in multiple different ways on and off the bike.