Hi - The VTech CS6909 is an expansion handset that requires a telephone base model VTech CS6929 or CS6919. All our units have excellent audio quality. For more details, you can contact our Customer Support at 1-800-595-9511. We are open from 9:00 AM to 3:00 PM, Mondays through Fridays.
Thank you,
-VTech Support
3 years ago
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Posted by:
VTech Baby Monitors Team