This amplifier is applicable to: cable TV analog (closed circuit) signal/cable TV digital signal/ground wave (DTMB) signal/outdoor antenna signal, pay attention!! (Satellite signal ) 1. Amplifier gain is 20db 2. Amplifiers are not universal. The effect depends on the environment in which they are used. The installation effect in each family also be different 3. The installation position should be as far away from the TV as possible, and can be installed close to the branch of the cable station, so as to a better signal to noise ratio index and image clarity 4. Need some professional knowledge to use this product !!!Please note that The input voltage of the amplifier needs to be 220V to work. If you need a US Plug, please explain the remarks to customer service. Thank you Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC220V Color: Silver Material: Aluminum Alloy Package Contents: 1*Ground Wave DTMB Cable TV Splitter Amplifier Only the above package content, other products are not included. Note: Light reflection 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.