Unity collects some or all of the following information about your device: unique device identifiers (e.g., IDFV for iOS devices and Android ID for Android devices); IP address; country of install (mapped from IP address); device manufacturer and model platform type (iOS, Android, Mac, Windows, etc.) and the operating system and version running on your system or device; language; CPU information such as model, the number of CPUs present, frequency, and instruction set support flags; the graphics card type and vendor name; graphics card driver name and version (e.g., “nv4disp.dll 22.214.171.124”); which graphics API is in use (e.g., “OpenGL 2.1” or “Direct3D 9.0c”); amount of system and video RAM present; current screen resolution; version of the Unity Editor used to create the app; sensor flags (e.g., device support for gyroscope, touch pressure or accelerometer); application or bundle identification (“app ID”) of the app installed; unique advertising identifiers provided for iOS and Android devices (e.g., IDFA or Android Ad ID); and a checksum of all the data that gets sent to verify that it transmitted correctly.
IP address and device identifiers, as well as events completed or actions taken within the app, including level, number of credits, time it took you to earn them, metadata about in-app communications and the value and details of purchases. This collection and use of data makes it possible for your experience to operate as expected by permitting you to do things like redeem rewards you have earned or return to where you left off in a app. Other Unity customers may have access to aggregated reports about app activity in general across a number of apps. These reports are based, in part, on your app activities, but do not specifically identify you or your device. The reports described in this paragraph help developers make decisions on optimal methods to run the apps they have made for you. For example, the developer may need to know the types of devices running the app to determine how to support app updates on an ongoing basis. Some data collected by Unity Analytics may be used by Unity Ads for personalized advertising; see the FAQs related to advertising for more information.
All those informations were taken from the Unity3d website.