Installation Method:1. Identify the screw hole position on the wall; 2. Use the electric impact drill to drill 2 holes at the fixed screw hole position; 3. Put the expansion screw in and the process installation is completed. Specification: Material: ABS Color: Shown as picture Battery: 2*AA(No.5) batteries (excluded) Bottom Diameter: Approx.12.5cm/4.9in Height: Approx.9cm/3.5in Package Weight: Approx.177g/6.2oz Package List: 1 * Dummy Camera 1 * Expansion Tube 1 * Screw Kit Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.