Plug-and-Play, battery free, apps free for Apple products (IOS above 5.0) - Compatibility with Android Smartphone: need to download app "Camera 360", and a setting need for certain smart phones. - Details refer to user manual. - Quick spin knob for fast and secure mounting. - Extendable up to 36 inch, adjustable phone holder allowing random rotation of shooting angle. - Allows for selfies or above-crowd shots. - Simple use: no battery, simply plug in the 3.5mm audio cable and press the shutter for pictures.