This waterproof and weatherproof solar warning light is designed for outdoor use. Its top mounted 3.75 inch solar panel and internal rechargeable battery charge daily from sunlight. Its four (4) internal AMBER LED lights turn on automatically each dusk and provide a bright white light in 360 degrees. Select either Continuous-on, Slow flash (15 flashes per minute) or Fast flash (60 flashes per minute) using the underside mounted push button. (For operation, turn the on-off switch to on to permit charging and operation). Expect up 8 to 12 hours of operation, depending on the amount of direct sunlight received. Slow flash provides the longest operating times. Also available in White LED, Red LED and Green LED and Blue LED versions also (see other listings). See our other listings for a larger 6" commercial grade solar warning light.