Sony CDX-M850MP Car Radio Code Entry Instructions :

Sony CDX-M850 Stereo Code Entry 

Sony CDX-M850

When you switch on the car radio the display will show [ SECURITY CODE INPUT ]
Open the front panel by pressing the left hand button on the fascia.
The display will show [ CODE IN 0000 ]
Press the [ + ] Button until you reach the first digit required then press the [ SEEK ] key to enter
Press the [ + ] Button until you reach the second digit required then press the [ SEEK ] key to enter
Press the [ + ] Button until you reach the third digit required then press the [ SEEK ] key to enter
Press the [ + ] Button until you reach the fourth digit required then press the [ SEEK ] key to enter
The clock will be displayed once finished.

Press the [ SOURCE ] key to switch the radio on.

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Now I will give you some details and characteristics about the Sony cdx m850 mp car radio :Without any buttons or controls to get in the way, the entire front panel becomes an exciting, full-motion fluorescent display with high-resolution graphics. In this mode, you use the supplied wireless remote to make all basic system changes.
Need to fine tune something? Push a button, and the faceplate motors down to reveal a smaller display and a full soft-touch control panel. Access the seven EQ presets and 7-band equalizer of Sony's EQ7 to adjust your sound.
The CDX-M850 will play your CDs, CD-Rs, CD-RWs, and even your long-playing MP3-encoded discs, while the top-of-the-line SSIR-EXA tuner locks in on stations near and far. If you love radio, add Sony's optional XM tuner and go wild with the innovative, diverse programming of XM Satellite Radio
If you need more entertainment the CDX-M850 will also control a Sony disc CD changer and you can hook up yet another source to the auxiliary input. Three sets of preamp outputs send a righteous 4-volt signal to any outboard amps in your system.
Details:

• Active Black Panel motorized fold-down faceplate
  
• full-motion fluorescent display
  
• plays CDs, CD-Rs, CD-RWs, and MP3-encoded discs
  
• CD/MD changer controls
  
• EQ7 (7-band equalizer and 7 preset tone curves)
  
• Dynamic Soundstage Organizer
  
• SSIR-EXA tuner
  
• 18 FM/12 AM presets
  
• seek tuning
  
• XM Satellite Radio controls (XM subscription, optional Sony XM tuner, and antenna required to receive the satellite radio signal) — service is available only in the lower 48 states, not available in Alaska, Hawaii, or U.S. territories
  
• 4-volt front and rear preamp outputs
  
• two 4-volt mono subwoofer outputs
  
• high-pass and low-pass filters
  
• CD text
  
• displays 8 characters of XM Satellite Radio info
  
• auxiliary input
  
• wireless remote
  
• clock
  
• 23.2 watts RMS/52 peak x 4 channels
  
• CD frequency response 10-20,000 Hz
  
• CD signal-to-noise ratio 90 dB
  
• FM sensitivity 9 dBf
  
• 1-year warranty