Train your mind with this digital Japanese soroban; a solar powered calculator and time piece within one sleek credit card sized case.

Made of wood with a touch sensitive panel, there are two modes; calculator mode – use the touch screen like a soroban – this classic style of calculation will develop your mind and improve your calculation skills! 1-4 units in each column of the bottom section, +5 units in each column of the top section. The beads will automatically show the time in the same manner when you switch to time mode. Continue reading →