It charges itself and it sets itself. Finding it is the hard part.

Wave Ceptor is Casio’s name for watches that receive a standard time signal by radio. Multi-Band 6 means the receiver knows six of those signals, covering Japan, China, North America, the UK and Germany, and corrects the watch overnight when it is within range of one.

Pair that with solar charging and the result is a watch that is never set and never opened. The retailer listings describe a power reserve of around four months on a full charge with functions in use, and around 22 months in power-saving mode.

The WVA-M630D-2A2JF is described as an analogue-digital model, hands plus an LCD, in a 42.1mm case about 11mm thick with a stainless steel bracelet. The functions listed are world time, a chronograph, a countdown timer, an alarm, a perpetual calendar, day and date, a backlight and a charge indicator.

Water resistance is given as 50m, which is rain, showers and brief splashes rather than swimming. That fits what this is: a commuter watch with a self-setting clock, not a sports watch.

The JF suffix marks a Japan-domestic reference. It reaches other markets through importers, which is why the catalogue entry here is an Amazon search rather than a single listing, and why none of the figures on this page come from Casio directly.

Radio sync also depends on geography. Multi-Band 6 covers the regions above; outside them the watch keeps time as an ordinary quartz and is set by hand. Check which signal you are near before paying for the receiver.