Introduction
This instruction manual provides detailed guidance for the proper use and maintenance of your Citizen CB5874-57A Eco-Drive Sport Watch. Please read this manual thoroughly to ensure optimal performance and longevity of your timepiece. Your watch features Citizen's Eco-Drive technology, powered by light, and Atomic Timekeeping for superior accuracy.
Watch Components
Familiarize yourself with the various parts of your Citizen CB5874-57A watch.

Image 1: Front view of the Citizen CB5874-57A Eco-Drive Sport Watch, showcasing the silver-tone dial, chronograph subdials, and tachymeter bezel. The watch features a stainless steel bracelet and case.

Image 2: Side view of the Citizen CB5874-57A Eco-Drive Sport Watch, highlighting the watch's profile, crown, and pushers. The stainless steel bracelet is also visible.

Image 3: Back view of the Citizen CB5874-57A Eco-Drive Sport Watch, showing the case back engravings including "Citizen Watch Co.", "Eco-Drive", "Radio Controlled", and "W.R. 10 BAR". The clasp of the stainless steel bracelet is also visible.
Setup
1. Initial Charging (Eco-Drive)
Your Eco-Drive watch is powered by light. Before initial use, or if the watch has stopped, expose the dial to bright light (natural or artificial) for several hours to ensure a full charge. Avoid placing the watch in direct sunlight for extended periods in hot environments to prevent overheating.
2. Atomic Time Synchronization
The CB5874-57A features Atomic Timekeeping technology, synchronizing with atomic clocks for superior accuracy. The watch automatically attempts to receive time signals daily. For manual synchronization or to check reception status, refer to the detailed instructions in the "Operating Instructions" section.
3. Setting Time Zone
To ensure the correct time is displayed, set your watch to the appropriate time zone. This model supports synchronized time adjustment in 24 time zones. Consult the "Operating Instructions" for specific steps on how to select and set your desired time zone.
Operating Instructions
Your Citizen CB5874-57A watch offers a range of functions. The specific operation of each function typically involves using the crown and pushers located on the side of the watch case. Refer to the markings on the dial and the watch's physical controls for interaction.
Chronograph Function
The 1-second chronograph measures up to 60 minutes. To operate:
- Press the upper pusher to start the chronograph.
- Press the upper pusher again to stop the chronograph.
- Press the lower pusher to reset the chronograph to zero.
Perpetual Calendar
The perpetual calendar automatically adjusts for odd and even months and leap years, ensuring the correct date is always displayed without manual adjustment until the year 2100. The date is typically displayed in a small window on the dial.
12/24 Hour Time Display
The watch can display time in either 12-hour or 24-hour format. Consult the watch's specific mode setting instructions to switch between these formats.
Alarm Function
Your watch is equipped with an alarm function. To set and activate the alarm, typically you will need to enter a specific mode using the crown or pushers and then adjust the alarm time using the watch hands or subdials. Refer to the detailed instructions for setting the alarm.
Power Reserve Indicator
The power reserve indicator shows the current charge level of your Eco-Drive watch. Ensure the watch is adequately charged by exposing it to light regularly to maintain optimal function.
Maintenance
Cleaning Your Watch
Wipe the watch case and bracelet regularly with a soft, dry cloth to remove dirt and moisture. For stainless steel, a slightly damp cloth can be used, followed by drying. Avoid using harsh chemicals or abrasive materials.
Water Resistance
The Citizen CB5874-57A watch is water resistant to 10 BAR (100 meters). This means it is suitable for swimming and snorkeling, but not for scuba diving. Ensure the crown is pushed in completely before exposing the watch to water. Do not operate the crown or pushers while the watch is wet.
Eco-Drive Charging
To maintain a full charge, expose your watch to light regularly. If stored in darkness, the watch may enter a power-saving mode or stop. Regular exposure to light will reactivate it and recharge the power cell.
Troubleshooting
- Watch Not Running: Ensure the watch has been sufficiently charged by exposing it to bright light for several hours.
- Incorrect Time Display: Verify that the watch is set to the correct time zone. If atomic time synchronization is not occurring, try initiating a manual reception in an open area away from interference.
- Hands Not Moving Correctly: If the watch hands are misaligned or not moving, perform a full reset or hand alignment procedure as detailed in the comprehensive user manual available on the Citizen website.
Specifications
| Model Number | CB5874-57A |
| Movement | Eco-Drive (Light-Powered) |
| Timekeeping | Atomic Timekeeping Technology with Synchronized Time Adjustment (24 Time Zones) |
| Chronograph | 1-Second Chronograph, measures up to 60 Minutes |
| Calendar | Perpetual Calendar |
| Additional Functions | 12/24 Hour Time, Alarm, Power Reserve Indicator, Date Display |
| Crystal | Mineral Crystal |
| Dial Color | Silver-Tone |
| Case Material | Stainless Steel |
| Bracelet Material | Stainless Steel |
| Water Resistance | 10 BAR (100 Meters) |
| Batteries | 1 Lithium Ion battery (included, internal for Eco-Drive) |
| Package Dimensions | 11.51 x 9.4 x 7.59 cm |
| Item Weight | 358 g |
Warranty and Support
Your Citizen watch is covered by a manufacturer's warranty. For detailed information regarding warranty terms, service centers, and additional support, please refer to the official Citizen website or the warranty card included with your purchase. For further assistance, contact Citizen customer service.
Official Citizen Website: www.citizenwatch.com





