The Ruputer has a 16-bit, 3.6 MHz processor and 2 MB of non-volatile storage memory and 128 KB of RAM.
Under normal conditions, the watch goes into standby mode down when not in use in order to extend its battery life.
Communication with other devices is either through a 38,400-bit/s serial port dock, or through the 9,600 infrared link, the transmitter of which is mounted to the upper middle of the watch.
Considering the type of system there is a fair amount of software available, although some of the programs written for the Ruputer are either entirely in Kanji script or will not run due to the increased speed of the onHand's processor.
[citation needed] One developer has made a prototype for a docking station for the watch that includes a screen illuminator and a half-keyboard.
The Ruputer and onHand PC failed to achieve widespread success, for a number of reasons.
First, their screen is too small to display more than a handful of text, making it awkward to view data.