Platon Scientific calculators offer all basic operations and combine many academic, scientific and financial functions in one device. The input is via the large keys. The supplied values are displayed on the 10 digit display. This scientific calculator is especially designed for the visually impaired. It comes in 3 flavours – Platon Scientific (speech output), Platon XL (extra-large display and buttons) and Platon XL Voice (extra-large display and buttons and speech output). Spoken functions are with a clear, natural language in 6 volumes. Power is supplied from AAA batteries.