This is an interior item that combines a sensor light that automatically turns on when someone passes by and an emergency light that is useful in times of need, making it helpful for both crime prevention and disaster preparedness. The sensor light detects brightness and is an energy-saving design that only lights up when it's dark. ● Actual size/contents: 5 x 3.5 x 26cm, ABS resin, uses 3 AAA batteries (sold separately)