LED Drivers are a type of transformer and electrical device which are used to regulate power to LEDs, string lights, sign lights and other electrically powered devices. LED Drivers are available in a wide range of configurations and sizes to help accommodate the todays all types of DIY projects and new fixtures designs. This LED Driver has a "100-240Volts" Input Voltage which is converted to "3-12" Volts. (DC) Measurements 1.65" Long x 1.57" Width x 0.83" Height. Always make sure to check LED input requirements when setting up a new circuit using an LED Driver. Always make sure power is off when working with electrical parts and fixtures.