Vintage Speech+ Telesensory calculator

From: Richard
Email: volsfan199@yahoo.com


I just came across one. It has the calculator, the carrying case, and the ear adaptor, which looks to be unused. It is the one from 1975. I do not have the charger, and it will not turn on. Is there a way to get it to work? ARe the batteries replaceable, or could I use another type charger to see if these batteries will charge up (though that is doubtful)? Also, what would a unit like this be worth?