Parameters:Power: DC3.5V /2A (adapter AC 110V-240V 50/60Hz)Brightness 100-800 LM adjustableLight Source Life: 5000k-8000kProjection Distance:1.5m-5m Features:Use of 5W high brightness LED light source, low temperature cold light source, a over-length life (40,000 hours), green energy conversation.180-degree rotational projection, stepless brightness adjustment.High-precision clock mechanism, LCD display, simple and easy single-button timing.The classic pointer clock or a digital display dial pointer clock, digital Rome and other clock dial.Projection distance of 1.5 meters to 5 meters ( Such as the ambient light is dark, the projection distance can be greater.)