Uniden DECT 6.0 Phone w/ CID 4 HS

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Uniden DECT 6.0 Phone w/ CID 4 HS
$44.99 + $5 Standard OR $9 Two-Day OR $12 One-Day Shipping
Condition: Refurbished

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Oh look. Uniden cordless phones again…

I don’t understand why adding the waterproof handset reduces the expandability. What if you add two waterproof handsets?