: Good for consumer-facing operation guides rather than technical repairs.

(Source) button repeatedly to toggle between FM1, FM2, and AM bands. Tuning +/- buttons for incremental frequency shifts. Auto Search : Press and hold Tuning +/-

Look for a sticker beginning with "BP" followed by 12 digits.

: Typical of Blaupunkt’s "Pro-Line" standards, it offers stable analog radio reception (FM/AM) and was designed for reliability in standard vehicle environments. Security Lockout : Like many Blaupunkt units of this era, the 815 features a security code

Support for MP3 and WMA files via external interfaces, a staple of Blaupunkt's mobile audio systems .