Input: 110V/220V AC Safety features: automatic overload cut-off, over-voltage cut-off, automatic thermal cut-off, short circuit protection Voltage consistency: No voltage fluctuation during power up, operation, receive, or shut down No fan inside the case; runs quietly. Metal case with ventilation holes for efficient heat dissipation Suitable for LED strips, 3D printers, ham radio receivers, CCTV cameras, car subwoofer amplifiers, audio amplifiers, wireless routers, ADSL modems, HUBs, audio/video power supplies. Indoor use only Color: As shown Material: Metal Package contents: 1 x 12V 20A Power Supply or 1 x 12V 15A Power Supply or 1 x 12V 40A Power Supply Only the above package content included; other products not included Note: Lighting and display differences may cause slight color variation between image and actual item. Measurement error allowed: +/- 1-3 cm