Switching Power Supply- Transformer- 12 V for CCTV s & LED Sign BoardFeatures:Made of high quality aluminum alloy material, rust resistance and corrosion resistance, solid and durable in use.There are two cooling methods: free air convection(where the power supply cools with ventilations i.e holes located on the upper part).cooling and fan cooling(where the power supply cools with the use of a fan located on the upper part or on the side).With short circuit protecting function and over temperature protecting function, the power supply is safe and reliable to use.Easy and convenient to install, though professional installation by qualified electricians is highly recommended.Widely applicable for LED display lights and sign boards, household equipment, industrial equipment, monitoring equipment, industrial automation machinery, industrial control systems, mechanical and electrical equipment, electronic instruments and equipment, etc.