Installation: It is best to use the supplied expansion screws for installation and fixing. You can also use double-sided foam stickers, etc. fixed (if using double-sided foam stickers, first determine the stickiness of the installation location. If the adhesion is poor, it may not stick) Install a surveillance camera at the door or at an unavoidable intersection to prevent criminals from approaching you, so that you can work and live with peace of mind! Realistic appearance, affordable price, suitable for homes, shopping malls, factories, businesses, etc. Disguising the real thing as fake, it plays the role of intimidation and anti-theft. Working status: Red LED light flashes (interval 1-2 seconds), red light keeps flashing when the battery is installed. Note: It will continue to flash when the battery is installed, no switch is needed, until the battery runs out and replace the battery, then replace the battery. Product material: ABS Styrene; Product size: bottom diameter 11.5cm, height 7.5cm. Note: Uses 2 5# batteries (need to be purchased separately) Note: The data is all measured manually, please allow 1-3cm error due to differences in light and display, it may exist color differences, please refer to the actual item received.