Input: 110V/220V AC; Safety features: automatic overload cut-off, over-voltage cut-off, automatic thermal cut-off, short circuit protection. Voltage Consistency: There is no voltage fluctuation during power up, transmit, receive, shut down. There is no fan inside the case and it runs quietly. The metal case has many holes to make heat dissipation more efficient. Perfect for LED Strips, 3D Printers, Ham Radio Transceivers, CCTV Cameras, Car Subwoofer Amplifiers, Audio Amplifiers, Wireless Routers, ADSL Cats, HUB, Audio/Video Power Supplies. Indoor use only! Colour:As shown Material:Metal Package Contents: 1 x 12V 20A Power Supply Only the above package content, other 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.