300W LOW VOLTAGE TRANSFORMER100% OUTPUTIt can avoid the problem of losing some power due to wires issues to achieve 100% full output.120V AC TO 12/15V ACIt can change 120V AC to 12V AC or 15V AC can avoid many problems due to voltage drop, and illuminate lights further away. Suitable for multiple situations.(Note: 12V AC and 15V AC outputs cannot be performed simultaneously:D)OVERLOAD DISPLAYIf the device connected to this transformer exceeds 120W, then the LCD display will indicate that the transformer is overloaded.ONE-CLICK SET UP SYSTEMSimply press and hold the "MODE" button for 3s to use our pre-set optimal switch setting time.