SPC 3604N - Advanced Features and Operations

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 Calculator and key tone function
 Set PABX code
 16 levels of LCD contrast
 Pulse/Tone dialing mode compatible
 4 levels of hands-free volume for selection
 Ringing volume 5 steps selectable
 LCD Backlight function
 Thunder-proof and anti-dialing from parallel phones
 Hands-free dialing and speaking function
 In use LED indicator