AusweisApp2 is a software application that you install on your computer to use your national identity card or your electronic residence permit for online identification. It is available for the most commonly used operating systems. It is compatible with all commonly available web browsers.
You can access the manual from the menu point Help in AusweisApp2.
Requirements for using online identitfication cards with Android devices
With an android (version 4.3 and higher) smartphone or tablet the online identification ca be used without an additional card reader. To do this, the smartphone or tablet must have an NFC interface in the first place. The second requirement for the device is the support of the communication function "Extended Length". This function must support both the NFC chip and the firmware of the respective device manufacturer. In the third place, the NFC chip must have a suffcient field strength, which ensures that the ID card is supplied with sufficient power to read the stored data.
A list of supported devices and further information you will find here.
Software integrity check
In order to make sure that the file you have downloaded has not been manipulated (integrity check), you can compare the hash value. The valid hash values of the AusweisApp2 are published on the website of the Federal Office for Information Security.