Powerful, durable and rechargable. Enjoy fun-filled illuminated evenings in the pool with this convenient alternative to installed pool lighting. Simple to use, the Ultra Light is powered by a rechargable battery that provides up to 12 hours of light between charges. After charging, simply turn it on and toss it in. Incredibly bright, 64 LED illumination powers enough light for up to a 20 ft x 40 ft pool. Charging unit included with light.