You say you looked in the manual? It's on page 5.
MAIN FEATURES
No Programming Required – Factory programmed microSD® card for all known radio systems in the US and Canada. The database is updatable with the Sentinel software and Uniden updates the main database weekly.
Scan by Location – Allows you to set your location(s) by zip/postal code or GPS coordinates for instant reception. The Auto-locate feature will find local systems if you don’t know where you are.
Favorites Scan – Allows you to organize your Systems into Favorites Lists. The scanner will scan multiple Favorites Lists and Full Database at the same time.
4 GB microSD card (provided - 1 GB up to 32 GB supported) – For storing Favorites Lists, Profiles, all your settings, Discovery sessions, and recording sessions. (BCD436HP - located behind the batteries; BCD536HP - located on the the scanner faceplate.)