Casio STR-900 Digital Watch
Module: 2985
Introduction
Disclaimer
Casio Computer Co., Ltd. is not responsible for any damage that may occur from the use of this watch, and does not accept any claims from third parties.
General Description of Operating Modes
The watch features several buttons: Button A, Button B, Button C, Button D, and Button L. Button L is used for the backlight.
Pressing [Button C] sequentially cycles through the modes: Timekeeping Mode → Stopwatch Mode → Stopwatch Logbook Mode → Countdown Timer Mode → Alarm Mode → Dual Time Mode → Timekeeping Mode.
Backlight
Press [Button L] in any mode to turn on the backlight.
Timekeeping Mode
Setting Time and Date
1. In Timekeeping Mode, press and hold [Button B] until the seconds display starts flashing, indicating it is selected for setting.
2. Press [Button C] to cycle through the settings: Seconds → Hours → Minutes → 12/24 Hour Format → Year → Month → Day → Seconds.
3. To set seconds, press [Button D] to reset the seconds to 00. If the seconds are between 30 and 59 when [Button D] is pressed, the minute count will increment. If seconds are between 00 and 29, the minute count will not change.
4. Use [Button D] to increase values and [Button A] to decrease values for minutes, hours, etc.
5. Press [Button D] to toggle between 12-hour and 24-hour formats. In the 12-hour format, [P indicator] indicates PM.
Holding down a button allows values to change at a faster rate.
The day of the week is set automatically according to the date.
The date can be set from January 1, 2000, to December 31, 2039.
6. After setting the date and time, press [Button B].
Stopwatch Mode
Overview
The stopwatch mode allows you to measure elapsed time, lap times, split times, and times for specific distances. It can also calculate your pace or running distance based on your personal data.
The measurement range is up to 99 hours, 59 minutes, 59.99 seconds.
Using Personal Data for Distance Calculation
To use the distance calculation feature based on personal data, you need to:
- Enter your personal data.
- Enable the step count sound signal.
You can view all measured data in the Stopwatch Logbook Mode.
Performing Measurements
Measuring Elapsed Time
Start: [Button A] → Stop: [Button A] → Restart: [Button A] → Stop: [Button A] → Reset/Save: [Button D]
Measuring Lap Times / Split Times
Start: [Button A] → Split Time: [Button D] (Split time is displayed for 8 seconds while measurement continues. Data is saved.) → ... → [Button D] → Stop: [Button A] → Reset: [Button D]
During measurement, the upper display shows the current measurement number and lap time. The lower display shows the cumulative split time.
When the sound signal function is enabled, a signal will sound every 30 seconds from the start of measurement, and every 30 seconds when [Button B] is pressed. If the signal does not sound for any reason after being enabled, press [Button B] to change the display format, which should activate the signal.
Selecting Measurement Display Format
Press [Button B] to switch between displaying lap times ([LAP indicator]) and split times ([SPL indicator]).
For measured times under 60 minutes, the display shows minutes, seconds, and 1/100 seconds (upper and lower displays). For times over 60 minutes, it shows hours, minutes, and seconds (upper display). For times over 10 hours, it shows hours, minutes, and seconds (lower display).
Stopwatch Logbook
Overview
This mode allows you to view or delete measurement data saved in the Stopwatch Mode. Data is automatically sorted into entries, each with a number. The logbook can store up to 61 entries. If the logbook is full, older entries are automatically deleted to make space for new ones. When new data is entered into a full logbook, the oldest data within an entry is deleted to accommodate the new data.
Viewing Saved Data
1. In Stopwatch Logbook Mode, press [Button B] to select an entry number whose data you wish to view.
2. Press [Button D] and [Button A] to scroll through data within an entry: Entry Number → Lap Time/Split Time → Best Lap Time → Entry Number.
The [BEST indicator] shows the best lap time within each entry.
The format of measured values and units correspond to the format and units selected in Stopwatch Mode.
After scrolling through all entries, the total measurement time entry appears. The size of this entry does not affect the memory available for stopwatch measurements.
3. After scrolling through all entries, the total distance measurement value appears.
Deleting Logbook Data
1. In Stopwatch Logbook Mode, select the entry you wish to delete.
2. Press and hold [Button A] and [Button D] simultaneously until the [CLR indicator] appears and a beep sounds. This deletes all saved data within that entry.
Deleting Total Measurement Time
1. In Stopwatch Logbook Mode, select the entry containing the total measurement time.
2. Press and hold [Button A] and [Button D] simultaneously until the [CLR indicator] appears and a beep sounds.
Countdown Timer Mode
Overview
The timer can be set from 1 minute to 100 hours. A sound signal will activate when the countdown reaches zero.
Setting the Timer Start Time
1. Press and hold [Button B] in the Countdown Timer Mode. The hour value will flash, indicating it is selected for setting.
2. Press [Button C] to cycle through the settings: Hours → Minutes → Hours.
3. Press [Button D] to increase values and [Button A] to decrease values for the start time.
Holding down these buttons allows values to change at a faster rate.
To set the start time to 100 hours, enter "0:00".
4. After setting the time, press [Button B].
Using the Timer
Press [Button B] in the Countdown Timer Mode to start the countdown.
Press [Button B] to stop the countdown.
You can resume the countdown by pressing [Button B] again.
After stopping the countdown, pressing [Button D] resets the timer to the start time.
Auto-Repeat
When the countdown reaches zero with Auto-Repeat enabled, a 10-second sound signal will sound, which can be stopped by pressing any button. The timer will then automatically restart from the previously set time.
Auto-Repeat can be set for up to 7 cycles.
To enable/disable Auto-Repeat, press and hold [Button D] in the Countdown Timer Mode when the timer's start time is displayed.
Alarm Mode
Overview
You can set various daily alarms. At the set time, the alarm will sound for 10 seconds. If the hourly chime is enabled, a short beep will sound at the start of each hour. If the snooze alarm is enabled, it will sound 7 times every five minutes until turned off.
Setting an Alarm
1. In Alarm Mode, press [Button D] to select the alarm type: Alarm 1 → Alarm 2 → Alarm 3 → Alarm 4 → Alarm 5 → Hourly Chime (:00).
Alarm 1 can be used as a regular alarm or a snooze alarm.
2. After selecting the alarm type, press and hold [Button B]. The hour value will flash, indicating it is selected for setting. The alarm is automatically enabled at this point.
3. Press [Button C] to cycle through the settings: Hours → Minutes → Hours.
4. Press [Button D] to increase values and [Button A] to decrease the selected value.
Holding down a button allows values to change at a faster rate.
The time format (12-hour or 24-hour) matches the format selected during current time setting.
When using the 12-hour format, be careful to set the correct AM/PM time.
5. After setting the time, press [Button B] to return to Alarm Mode.
Checking Alarm Sound
In Alarm Mode, press [Button D] to check the alarm sound.
Enabling/Disabling Alarms 2-5
1. In Alarm Mode, press [Button D] to select alarm types 2 through 5.
2. Press [Button A] to enable or disable the selected alarm type.
When any of the 4 alarms are active, the [ALM indicator] appears on the display.
Enabling Snooze Alarm (1)
1. In Alarm Mode, press [Button D] to select alarm type 1.
2. Press [Button A] to cycle through: Normal Alarm → Snooze Alarm → Alarm Off. The [ALM indicator] appears for a normal alarm, and the [SNZ indicator] appears for a snooze alarm. Selecting '1' with the snooze alarm enabled automatically switches it to a normal alarm.
Enabling/Disabling Hourly Chime (:00)
1. In Alarm Mode, press [Button D] to select the hourly chime (:00).
2. Press [Button A] to enable or disable the hourly chime.
When the hourly chime is enabled, the [:00 indicator] appears on the display.
Dual Time Mode
Overview
In this mode, you can view the current time in another time zone.
Setting Dual Time
1. In Dual Time Mode, press [Button D] to increase the time by 30-minute increments, and [Button A] to decrease it.
2. Pressing [Button B] sets the current time as the dual time.
Other Functions
Backlight
The backlight uses an electro-luminescent panel (EL). Its brightness may decrease with continuous use. A faint sound may be heard during illumination due to vibrating elements, which is normal and not an indication of malfunction.
The backlight may be difficult to see in direct sunlight. Frequent use of the backlight reduces battery life.
Auto-Backlight
You can enable or disable the Auto-Backlight function by pressing and holding [Button D] for 2 seconds in Timekeeping Mode. The Auto-Backlight activates automatically when the watch is tilted at an angle of approximately 40 degrees relative to the ground. Do not use the Auto-Backlight function when the light could damage you or distract your attention, for example, while operating a motorcycle or bicycle.
Water Resistance
Classification
Watches are classified by water resistance levels (I to V) according to their degree of water protection. Refer to the table below for proper usage.
| Level | Case Marking | Splash, Rain, etc. | Swimming, Car Washing, etc. | Diving, Snorkeling, etc. | Scuba Diving |
|---|---|---|---|---|---|
| I | No | No | No | No | |
| II | WATER RESISTANT | Yes | No | No | No |
| III | 50M WATER RESISTANT | Yes | Yes | No | No |
| IV | 100M WATER RESISTANT | Yes | Yes | Yes | No |
| V | 200M WATER RESISTANT | Yes | Yes | Yes | Yes |
| 300M WATER RESISTANT | Yes | Yes | Yes | Yes |
Important Notes
Level I: The watch is not water resistant. Avoid all moisture.
Level II: Do not pull out the crown if the watch is wet. Do not press watch buttons underwater.
Level III: Do not press watch buttons underwater.
Level IV: If the watch is exposed to salt water, rinse it thoroughly and dry it.
Level V: The watch can be used for scuba diving (except for depths requiring a helium-helium mixture).
Some water-resistant watches have leather straps. Do not wear these watches while swimming or engaging in other activities where the strap may become submerged.
Never attempt to open the case or remove the back cover.
The gasket, which protects the watch from water and dust, should be replaced every 2-3 years by an authorized CASIO dealer or distributor.
If water enters the watch, have it checked immediately by a CASIO dealer or distributor.
Do not expose the watch to extreme temperatures.
Although the watch is designed for normal use, avoid rough handling and do not drop it.
Do not wear the watch too tightly. A finger should fit between the strap and your wrist.
To clean the watch and strap, use a dry soft cloth, or a soft cloth dampened with a mild neutral detergent solution. Never use volatile agents such as gasoline, solvents, spray cleaners, etc.
When not using the watch, store it in a dry place.
Avoid contact with gasoline, cleaning solvents, spray aerosols, adhesives, paint, etc. Chemical reactions caused by these materials can damage gaskets, the case, and the watch's finish.
Some watch straps feature silk-screened designs. Clean such straps carefully to avoid damaging these designs.
For Watches with Plastic Straps
A white powdery substance may appear on the strap; this is harmless and can be easily wiped off with a cloth. Sweat or moisture, or storage in high humidity, can lead to damage, tearing, or cracking of the plastic strap. To ensure a long service life for the plastic strap, wipe it with a soft cloth to remove dirt and moisture whenever possible.
For Watches with Fluorescent Cases and Straps
Prolonged exposure to direct sunlight can cause the fluorescent color to gradually fade. Prolonged contact with moisture can also cause the fluorescent color to gradually fade. Wipe off any moisture from the watch surface as soon as possible. Prolonged contact with any other wet surface may lead to discoloration of the fluorescent color. Ensure the fluorescent surface is free of moisture and avoid contact with other surfaces. Strong friction of a surface with applied fluorescent paint against another surface may transfer the fluorescent paint to that surface.
Technical Specifications
Accuracy
±15 seconds per month at normal temperature.
Timekeeping Mode
Hours, minutes, seconds, AM/PM indicator, year, month, day, day of the week.
Calendar System
Auto-calendar from 2000 to 2039.
Product Information
Product Name
Wristwatch, electronic / electro-mechanical quartz (men's/women's)
Brand
CASIO
Manufacturer
CASIO COMPUTER Co., Ltd.
Manufacturer Address
6-2, Hon-machi 1-chome, Shibuya-ku, Tokyo 151-8543, Japan
Importer
CASIO LLC, Moscow, Sushchevskaya St., Bldg. 27, Str. 1, Russia
Country of Origin
Japan
Warranty Period
1 year
Authorized Service Center Address
Refer to the warranty card.
Compliance
Product complies with GOST 26270-98 (clause 4.35). Certificate of Conformity No. ROSS JP. АЯ46.Д00003.
