Details:

Manufacturer ID:  JE-720U

Runs on three AA batteries.

Info regarding the speech synthesiser can be found from 1981 to 1985.

Usage:

The calculator pronounces all keys except ON, OFF, VOICE and READ.

VOICE deactivates/activates the voice function. (Default is “active”)

Click to view a full size picture (opens in a new tab)

Serial number:

Built in:

Functions:

Printing speed

Market-introduction:

Production until:

Price:

24100367

Approx. 1982  (The speech-IC, HD61885 A03, contains a Japanese date-code:  2B3 →  1982-Febr-3rd )

Addition, Subtraction, Multiplication, Division, Memory, Voice

-

Approx. 1981  ( Mentioned in The Argus-Press · ‎ 23 Nov 1982 · ‎ Newspaper)

Approx. 1984

Unknown