<b>Q & A: </b><br> <b>Q1:</b> Why your price is low, but quality is great? <br> <b>A1: </b>Because we are factory outlets, our Sales stratery is small profits but quick turnover. <br> <br> <b>Q2: </b>Why some customers said your dimmable transformer has buzz noise? <br> <b>A2: </b>Reason1, It was old version, we have upgrated new version and it is quiet operation now. <br> Reason2, some Special Wall dimmers are not compatible. <br> <br> The Upgraded design is Smaller, Quiet, has Greater operating efficency, has over-current protection, and eliminates problems with buzzing and overheating. </b></b> This Dimmable LED transformer is smaller, lighter, has greater operating efficency, Better Compatibility, has over-current protection, and eliminates problems with buzzing and overheating. <br>This is an excellent quality 12V50W Triac dimmable power supply. <br> Compatible with most AC wall dimmer like Lutron, Leviton and most other household dimmers. <br> Can be used for many 12v constant voltage LED lights and other applications. <br> Requires no minimum load and it is very quite without any buzz or humming noise. <br> Warning: Do not overload. Overload will cause the LED Transformer to fail. We are not responsible for misuse of LED power supply. <br>It is recommended NOT to exceed the LED transformer's capacity. Please calculate your load before connecting the power. <br><br> <b>Specification: </b><br> Output Current: 4.15A Output Voltage: 12V <br> Input Voltage: 100V-130V 50/60HZ <br> Size dimension: 195x45x33mm <br> NON-waterproof use for indoor dry location only. <br>