The Mighty Bright Baby Bright Sensor Light is motion-activated and detects movement up to 15 feet away, automatically turning on, and then turning off when the movement ceases. Its energy efficient LEDs are rated for 100,000 hours and are cool-to-the-touch. Powered by 4 C batteries (included) with a battery life of 90 hours, the lamp provides gentle low-light that is perfect for nighttime diaper changes, feedings, and safety checks.