Product name: Dual power supply ring cow transformer (for power amplifier) Front end power: 100W Input voltage: 220V 50HZ Output voltage: dual power supply 18V Colour: Red Material: metal Size: about 9 x 4cm Package Contents: 1 x Dual power transformer Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.