Works great on my Calisto Pro phone. I love Calisto Pro as a work phone. It has Dect 6.0 but the phone has Bluetooth built in so you can connect to a BT headset. After the battery died, I tried replacing the phone but couldn't find a similar setting. I could only find a Bluetooth based Dect phone. This means that the headset must be covered by the base. I am very happy to have found this replacement battery to continue using my Calisto Pro phone.
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