1.Work voltage:1~9V One piece of high efficient and constant current LED driver which built in bulbs enable the bulbs to be used in a wide-range voltages and keep the brightness going constantly. 2.LED power:1W 3.Long lifespan:>50,000hours 4.High intensity:>80LM LED brightness is higher than incandescence bulb's under the same power supply. 5.Lamp holder:standerised E10 6.Environmental friendly,energy saving and shock-resistance product.