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There is no benefit whatsoever in upgrading to V.4. In fact, two features
have been deleted, one being the ambient temperature display, and the
other I can't remember, but I expect another member will know. Also,
the handset shape is different, and less aesthetically pleasing, and doesn't sit properly in the plastic bracket. I've just remembered the other deletion.
You can now only power up the handset through the mount; before you
could power it up independently.
raymo
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