Based on the world record nomination from Asia Records Institute (ASRI) and Decision No. WK/USA.INDIA/704/2021/No.160, World Records Union (WorldKings) officially declared Casio Computer is "the world's first compact all-electric calculator manufacturer" on June 8, 2021.
Its products include calculators, mobile phones, digital cameras, electronic musical instruments, and analogue and digital watches. It was founded in 1946, and in 1957 introduced the world's first entirely electric compact calculator.
It was an early digital camera innovator, and during the 1980s and 1990s, the company developed numerous affordable home electronic keyboards for musicians along with introducing the world's first mass-produced digital watches.
Casio 14-A was the world's first compact all-electric calculator. The name 14-A indicates that the calculator operated with fourteen-digit numbers and was the first in its generation.
Technology: 342 relays, housed in a cabinet on which the typewriter-size key-entry terminal sat. Weight: 140 kg. Dimensions: 1080 × 780 × 445 mm. Display: illuminating pad. Power: 100V. Consumption: 300W.
According to en.wikipedia & firstversions.com