Cordless DECT CWD1800 phone, like this https://www.ebay.co.uk/itm/162373428190, but only one handset and base unit, see photo:
Needs 2 AAA rechargable batteries. It worked last time I used it many years ago. Should work plugged in to a fibre router for use as a digital landline.
Cordless DECT phone (Caversham Heights RG4)
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