Draytek VigorAP 902 Quick Start Manual page 10

Default Pre-Shared Key (PSK) with 13 ASCII characters is provided and
stated on the label pasted on the bottom of VigorAP.
Note
8. In the next page, click Finish. The system will make a connection
automatically. Open Online Status to see the result of network connection.
Note
For the communication, all wireless devices must support the
same encryption bit length and share the same key. If WEP
mode is selected, only one of four preset keys can be selected
at one time.
Under System Maintenance you can change the access point's
default admin password. You should do this immediately in
order to prevent users from accessing the VigorAP's
management interface and changing settings.