Bike Spoke Lights - Bicycle Lights for Wheels Decoration (Batteries Included) - LED Waterproof Cycling Tire Tyre Rim Alarm Lamp for Safety and Warning Install or remove without any tools only need 2 seconds Unit have a piece of paper disconnecting the battery The paper need to be removed to make the units function Secure remains securely locked in position even during off road use It is water and shock resistant This bicycle safety light will help you make your visible on the road in dark Suitable for the professional or casual bicycle rider