How to use

W770 Riiiver


Main specifications


Specifications and contents are subject to change without prior notice.

ModelW770 Riiiver
TypeAnalog solar-powered watch
Timekeeping accuracy
(without reception)
Average monthly accuracy: ±15 seconds when worn at normal operating temperatures between +5°C (41°F) and +35°C (95°F)
Operating temperature range‒10°C (14°F) - +60°C (140°F)
Display functionsTime: Hours, minutes, seconds, 24-hour
Calendar: Date, day of week
DurationFully charged to fully discharged
(when power save feature works about 7.5 hours a day):
 Approximately 9 months (using normally with a smartphone)
Approximately 1.5 years (using with no smartphones)
When power save functions all the day:
 About 4 years
Power reserve upon insufficient charge warning function: About 10 days
BatteryRechargeable cell (lithium button cell), 1pc.

Conditions of “standard use with a smartphone”

The following conditions are supposed as “Standard use with the smartphone” in this web manual.

Connection time6 hours/day
Notification10 times/day
(0.45-second vibration and 0.35-second sound emission are supposed for a notification.)
Chronograph1 hours/day
Power save7.5 hours/day

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Additional functions


Additional functions