This chip LED is one of the larger flat surface mount type of LED's. The 5050 size is what is on most reels of LED's but some reels use the 3528 size. As with all LED's, they work at approximately 3 volts DC. These LED's have 6 inch mag wire leads soldered to the chip. They are intended to be used with the two "Battery Kits" that we offer: 2450 battery kit and 2032 battery kit. This chip is available in cool white and warm white color.