Quarter cubic inch of rave is basically the 100 calorie pack of timing lights, size wise. Output wise, its two three watt LEDs are a much larger serving. The QCIoR unit (batteries not included) is basically an LED driver board and an uFreq unit soldered together back to back, and takes up about a quarter of a cubic inch. The system is powered by a 2S LiPo pack when I use it, but the LEDs could be changed out for more powerful ones, and the battery changed to match. Not recommended as a gift for photo-epileptics you value as friends.