Plantronics Wireless Headset System "date code" designates its date of manufacture, and it can be used to establish your warranty period. The date code is generally listed with your product’s model and part number, although this is not always the case.

Date code locations for Cordless & Wireless headset systems are below.
Savi Office Models WO100, WO200,W0300 &WO350
Date Code - 4 digits in the lower right hand corner of label on the bottom of the base (mmyy)
CS50 - Bottom of base begins with letter "B"
CS55 - Bottom of base begins with letter "B"
CS351N &
CS361N (Headset) - Under the cushion on the side w/microphone.
Base - Date Code - Bottom of base begins with letter "B"
CS50-USB - Bottom of base begins with letter "B"
CA10/CS10 - White label on the bottom of the charging base.
CS70/CS70N - Bottom of the base begins with the letter "B".
Voyager 510s - Bottom of base begins with letter "B"
Calisto Pro - Bottom of base begins with letter "B"
If you are unable to find your date code, please contact Plantronics Technical Support (800-544-4660). A dated proof of purchase can also be used to establish your warranty period.
To see the full line of PlantronicsWireless Headsets, visit www.Headset-Plus.com
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