D.O.B refer to Drive On Board. It comes with no traditional driver and capacitor. Its life span is double than regular lightings, and maintenance cost will cut up to 90% after 5 years. It's the future tech of whole LED lighting industry. Jiao Guang is a leading company on it, we are the first manufacture created 110-277V globe voltage D.O.B lighting products, and we also obtained US and China patent.