CoPilot

Speech output: Yes, Speech input: Yes, Stand-alone receiver: No, Interface: USB, Price: $399.

Street Atlas

Speech output: Yes, Speech input: Yes, Stand-alone receiver: No, Interface: Serial, Price: $179.95.

MetroGuide

Speech output: No, Speech input: No, Stand-alone receiver: Yes, Interface: Serial, Price: $174.98 (without the receiver).

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