The See 4 Safety Walker Light is an automatic light with a sturdy clip that attaches to walkers, rollators, and other mobility aids. People with arthritis using a walkers, canes or rollators for mobility will find this automatic light is easy to attach and provides excellent illumination. This walker light has a motion detector so that it turns itself on when in motion, and also in low level light conditions. The "intelligent" light turns itself off after 30 seconds if there is no motion or when it senses a well-lit environment. This patented automatic light is hands free, allowing the user to keep their hands securely on their mobility device. The light is easy to use. Simply flip the on/off switch to the on position, clip the light to round tubing on a walker or rollator, and start moving. Three bright LED lights are powered by two AAA batteries (included) and provide light for seeing safely. The light uses two sensors. First, a motion sensor determines movement. After 30 seconds of not being moved, the light turns off. Second, the light uses a lighting sensor to determine if it is in a low level light environment. Only when it is in a low light environment and in use will the light illuminate, saving batteries and time. See 4 Safety Walker Light Product Instructions See 4 Safety Walker Light Specifications: Includes: 2 standard AAA batteries. Length: 3 inches. Diameter: 1 1/4 inches.