This is an excellent quality ETL Listed 24v Triac dimmable power supply with junction box built-in. Compatible with most AC wall dimmer including Lutron, Leviton and most other household dimmers. It can be used for many LED lights and other applications. It is very quiet without any buzz or humming noise. Specification: Output Frequency: 50/60HZ Output Current: 3.3A or 4A (base on selection) Output Voltage: 24V Input Voltage: 100V-130V Size dimension: 10 3/8 in x 1.5 in x 2 5/8 in Weight: 2 lb 8 oz