Module No. 5658


This watch runs on power supplied from a rechargeable (secondary) battery that is charged by a solar panel. The solar panel is integrated into the face of the watch, and power is generated whenever the face is exposed to light.

Charging the Watch

When you are not wearing the watch, put it in a location where it is exposed to bright light.


While you are wearing the watch, make sure that its face (solar panel) is not blocked from light by the sleeve of your clothing. Power generation efficiency is reduced even when the face of the watch is blocked only partially.



Depending on light intensity and local conditions, the watch may become hot to the touch when exposed to light for charging. Take care to avoid burn injury after charging. Also, avoid charging the watch under high-temperature conditions like the ones described below.

On the dashboard of a vehicle parked in the sun

Near an incandescent light bulb or other source of heat

Under direct sunlight or in other hot areas for long periods

Checking the Charge Level

In the Timekeeping Mode, the function hand indicates the current charge level.

  1. Good (high charge)

  2. Good (medium charge)

  3. Low Battery

Low Battery

A low battery will cause [LOW] to flash and will disable the functions below.


Sounds (alarm, etc.)

Connection with a phone


If the charge level drops even further, [CHG] will flash and the hour and minute hands will stop at 12 o’clock. If this happens, all functions are disabled.


Dead Battery

The digital display will go blank if the battery goes dead. Memory data is lost, and watch settings are returned to their initial factory defaults.


Should the battery go low or go dead, expose the face (solar panel) to light as soon as possible.

Exposing the watch to light while its battery is dead will cause [CHG] to start flashing. Expose the watch to light to charge it until the Timekeeping Mode screen re-appears.


If [R] is flashing, it means that all functions, except for timekeeping, are disabled due to high momentary battery power consumption.


Charging Time Guidelines

The table below shows guidelines for approximate charging times.

Charging Times Required for 1 Day of Operation

Light Level (Lux)

Approximate Charging Time


8 minutes


30 minutes


48 minutes


8 hours

Charge Recovery Times

Sunny day, outdoors (50,000 lux)

Dead battery arrowR Medium charge

3 hours

Medium charge arrowR High charge

24 hours

High charge arrowR Full charge

7 hours

Sunny day, near a window (10,000 lux)

Dead battery arrowR Medium charge

7 hours

Medium charge arrowR High charge

92 hours

High charge arrowR Full charge

25 hours

Overcast day, near a window (5,000 lux)

Dead battery arrowR Medium charge

11 hours

Medium charge arrowR High charge

148 hours

High charge arrowR Full charge

40 hours

Indoor fluorescent lighting (500 lux)

Dead battery arrowR Medium charge

146 hours

Medium charge arrowR High charge


High charge arrowR Full charge



Actual charging time depends on the charging environment, watch settings, and other factors.

Power Saving Function

Leaving the watch in a dark location for about one hour between the hours of 10 p.m. and 6 a.m. will cause the display to go blank, and the watch to enter Level 1 power saving. If the watch is left in this condition for six or seven days, the watch will enter Level 2 power saving.

Power Saving Level 1:

Digital display goes blank to save power. The watch can connect with a phone at this level.

Power Saving Level 2:

All hands stop and the digital display goes blank to save power. All functions are disabled.

Recovering from Power Saving Operation

Use one of the operations below to exit power saving.

Press any button.

Move the watch to a bright location.


You can enable or disable Power Saving.

Note that the watch also may enter power saving if its face is blocked from light by your sleeve while you are wearing it.