The Sony HVL-20DMA is a dual on camera video light; it has the ability to produce 10 or 20 watts of illumination. It comes with adaptor bar that allows this light to work with smaller camcorders or camcorders without a mounting shoe. This device is powered by M Series Infolithium batteries used by many Sony Camcorders. Dual Configuration A selection switch allows the user to illuminate with 10 or 20 Watts. Adaptor Bar The adaptor bar attaches to the tripod 1/4-20 screw allowing the user to adjust lighting angles, attach other equipment such as microphones to the shoe or just allow some camcorders without a shoe to use a video light.