Rotary-dial phone handset Bluetooth mod

For sale on eBay, an old rotary-dial phone handset, modified to act as a self-contained, battery-powered Bluetooth handset.

there is an access hole to charge and operation is via a single rocker at the base (see picture) this enables volume up and down for the ear piece aswell as for the ringer volume. I will include the manual for operation.

Link (Thanks, Alfie!)