Superbikero Single par Rainjoy: The video is both arm-type, but it actually is a single version of one arm. It can be used for bicycles, kickboards, ice scooters, walks, and jogging. The battery operated LED reflector and rotating arm rearview mirror are integrated into the Superbikero single version; The arm rearview mirror and reflector with two functions. See backwards through You can send a note by yourself when you do; By attaching it directly to your wrist, you can adjust it and move it around. The mirror is small size (2.0 inches (5 cm) in diameter); This wristband instantly wraps around your wrist. An innovative accessory that combines practicality and safety; The 3 levels of flashing and illumination makes it very visible in the dark; The fluorescent colored material makes it easy to see in the day; The wide angle and 360 degrees. Angle freely without turning Can be replaced with commercially available button batteries.