This is an excellent quality ETL Listed Triac dimmable power supply. Compatible with most AC wall dimmer including Lutron, Leviton and most other household dimmers. Can be used for many LED lights and other applications. Requires no minimum load and it is very quiet without any buzz or humming noise. Warning: Do not overload. Overload will cause the AC adapter to fail. We are not responsible for misuse of the power supply. It is recommended not to exceed 80% or 96w of AC adapter's capacity. Please calculate your load before connecting the power. Specification: Output Frequency: 50/60HZ Output Current: Base on selection Output Voltage: 12V Input Voltage: 100V-130V Size dimension: 6.25" x 2.25" x 0.8" (25w) 7" x 2.5" x 1" (50w) 15"x 3" x 2.5" (120w) Waterproof can be used for indoor or outdoor location. Package content: 1 Piece ETL Listed 12V DC dimmable Power Supply