Citizen Caliber F810: Eco-Drive Multi-Function Analog-Digital Movement

The Citizen Caliber F810 is a sophisticated hybrid movement, combining the precision of Eco-Drive solar technology with both analog hands and a digital display. Designed for the tech-savvy user or international traveler, this movement delivers an array of features including world time, alarms, chronograph, countdown timer, and dual time zones, all in a format that’s easy to read and operate.

Whether you're heading to a business meeting across the globe or training for a marathon, the F810 provides unmatched functionality with no battery replacements ever needed.

Key Features

This movement is packed with functions ideal for users who want more from their watch than just the time.

Main features include:

• Eco-Drive solar-powered movement

• Analog time display with hour, minute, and second hands

• Digital display showing secondary functions

• World time: Covers 43 cities + UTC

• Chronograph: Measures up to 24 hours in 1/100-second increments

• Countdown timer: 99-minute capacity

• Dual time zones: Analog and digital can show different zones

• Two daily alarms with sound

• Perpetual calendar: Automatically adjusts for months and leap years

• Backlight: For digital display in the dark

• Power saving and low charge warning

• Battery life (reserve): Approx. 2 years on full charge (with power-saving on)

• High accuracy: ±15 seconds per month

Power Supply & Eco-Drive Benefits

Like all Citizen Eco-Drive models, the F810 uses solar cells to convert light into electrical energy. It stores this power in a rechargeable energy cell, removing the need for disposable batteries.

• Full recharge time: ~12 hours in sunlight, longer under indoor light

• Power reserve: ~2 years (with power saving)

• Low charge warning: Second hand jumps in 2-second intervals

• Power save mode: Reduces energy drain in darkness or storage

This system is environmentally friendly and perfect for long-term wearers.

Digital & Analog Coordination

The F810 excels at managing dual timekeeping:

• Analog time: Used for local or primary zone

• Digital time: Independently set, ideal for home or secondary zones

• The digital screen also shows alarms, chronograph readings, world time city, date, and more

• A light button activates a backlight for visibility in the dark

Users can swap time zones easily or lock settings during travel.

Chronograph & Timer

• Chronograph:

  • Measures up to 24 hours, 1/100-sec precision

  • Displayed digitally for accurate tracking

  • Ideal for training, sports, or timed activities

• Countdown Timer:

  • Settable from 1 to 99 minutes

  • Audible alarm sounds when countdown ends

  • Commonly used in intervals, cooking, or task timing

Alarms & Calendar

• Two daily alarms:

  • Fully customizable with tone indicators

  • Digital display allows easy activation/deactivation

• Perpetual Calendar:

  • Automatically adjusts for short months and leap years

  • No need for manual changes except when power is lost

Operation & User Interface

The movement is controlled through a multi-function crown and pushers:

• Crown: Used for switching modes, adjusting analog time

• Pushers (A, B, C, etc.): Navigate functions, reset chronograph, toggle light

Modes are indicated on the digital display, and transitions are smooth and intuitive once learned.

Compatible Watch Designs

The F810 powers modern analog-digital watches with a blend of utility and style, typically featuring:

• Large, legible dials with dual display

• Stainless steel, titanium, or resin cases

• Rotating bezels or tachymeter scales

• Water resistance from 100M and up

• Durable bands: Silicone, steel, or leather options

These watches are often part of Citizen’s Promaster, Skyhawk, or field-ready Eco-Drive collections.

Ideal User Profile

The Citizen F810 is built for:

• Frequent travelers who rely on world time

• Professionals needing alarms, calendar, and time zones

• Athletes or trainers timing sessions

• Tech-focused users who appreciate hybrid features

• Watch fans looking for no-battery, all-in-one function

Summary

The Citizen Caliber F810 blends advanced functionality with Eco-Drive convenience, supporting world time, chronograph, countdown, alarms, and a perpetual calendar—all in a rugged and stylish analog-digital format. It’s an ideal choice for users who want maximum utility without the hassle of battery changes or digital overload. If versatility, durability, and efficiency are what you need, the F810 delivers all that and more.