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The handset for that model is LS6405.
Sorry, there was a problem. Please try again later.Sorry I ran into problems using extra extension phones that were NOT specifically made for the base unit and your base unit is a more complex unit and the CS5109 phones are for a simpler base station. I emailed VTech support and they told me what model "extension" phones to purchase, or stop in or chat with the "Blue Shirts" to get their advice.
Sorry, there was a problem. Please try again later.I'm not sure. If you remove the battery of the extension base phone there should be a sticker with the model number on it under the battery pack. If not you can contact vetch. The # is 1-800-595-9511 and the web site is www.vtechphones.com.
Sorry, there was a problem. Please try again later.Hello - The cordless handset compatible with the model VTech LS6425-3 is the model VTech LS6405. Thank you, -VTech Support
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