Exercise time
Calories burned (kcal)
Time
Alerts
This watch enables you to select a target HR zone according to your fitness goals. By setting the target HR zone and personal data, the watch can monitor how well you do. The watch will send out visual and audible alerts if you are pushing yourself too hard or need to put more effort in.
For details of HR zones, refer to “Understanding heart rate” section in this manual.
If alert has been enabled and heart rate zone has been set:
ICON | BEEP(S) | DESCRIPTION |
/ ABOVE ZONE! | 2 | You have gone above your upper HR limit |
/ BELOW ZONE! | 1 | You have gone below your lower HR limit |
Remember, these alerts are based on a calculation of your maximum heart rate and the HR zone you selected. As such, it is an estimation and is only for guidance. If you feel you are working too hard, most likely you are. Adjust the HR zone to one that works for you.
Understanding Heart rate
Heart Rate zones and exercise
Heart rate is an indicator of the intensity of the exercise on your body. It is a useful tool for determining how effective a
This watch uses an estimation of your maximum heart rate (220 - age = MHR) to arrive at 5 HR zone settings specific to you.
HR zone | Corresponding | Description / benefit derived | Examples | |
settings | watch setting | |||
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| For beginners and those with health |
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| 50% - 60% | problems. Gets body used to exercise | Brisk walking | |
Fat |
| and improves health. |
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burning |
| Improves heart’s ability to deliver | Jogging, easy | |
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| 61% - 70% | oxygen. Calories burned mostly from | ||
| cycling. | |||
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| stored body fat. | ||
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| Increases endurance and muscle | Running, | |
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| strength. Breathing is faster and | ||
Aerobic | 71% - 80% | aerobic dance, | ||
deeper promoting proper circulation of | ||||
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| jumping rope. | ||
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| oxygenated blood. | ||
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| Builds muscle and enhances speed, | ||
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| power and performance levels. Body | ||
| 81% - 90% | resistance | ||
| requires more oxygen than it can | |||
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| machine. | ||
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| provide. | ||
Anaerobic |
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| For athletes. Vigorous training, usually |
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| 91% - 100% | done in short bursts to enhance power | Sprinting | |
| and performance. May increase chance | |||
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| of injury and soreness. |
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*The upper and lower heart rate limits are calculated by multiplying your maximum heart rate (MHR) by the percentages.
It is important to pace yourself, especially if you haven’t exercised for a while. Start off slow, aiming for the lowest range
To benefit most from your
Remember, if you rush in too quickly and push your body too hard before it’s ready, it can be counterproductive. You can hurt your muscles / tendons and may even result in injury and be a real step back from your goal.
IMPORTANT Always warm up before exercise and select the HR zone setting that best suits your physique. Exercise regularly, 20 to 30 minutes per session, three to four times a week for a healthier cardiovascular system.
WARNING Determining a suitable exercise intensity is a critical step in the process towards an efficient and safe training program. Please consult your doctor or health professional to help you determine exercise frequency and duration appropriate for your age, condition and specific goals.
Memory
1.Touch MODE/- repeatedly to select “MEM”. After 2 seconds, display will show the time and date of the most recent exercise session recorded or “NO RECORD” if there is no data.
2.Touch +/ST/SP to navigate to desired record.
3.Touch ENTER to toggle through the displays related to selected exercise session.
Total time taken for entire exercise
Maximum heart rate
Average heart rate
Total calories burned (kcal)
To return to screen which shows date and time of exercise session: Touch
Clear records
This watch can contain data for up to 99 exercise sessions. Individual memory cannot be selected and deleted. The watch only allows for all data to be deleted.
To delete memory:
1.Touch MODE/- repeatedly to select “MEM”.
2.Touch +/ST/SP repeatedly until “DELETE” will be displayed.
3.Touch MODE/- to confirm.
DONE indicates the record has been cleared.
MODE/- | +/ST/SP | MODE/- |
When starting an exercise and memory is full, “FULL” will be displayed, followed by “DELETE”.
•Touch MODE/- to delete all records
OR
•Touch ENTER 
to ignore and start an exercise without recording data for it.
Other operations and settings
Activate backlight
Touch EL. (Touch EL again to extend backlight for another 5 seconds).
NOTE The backlight function will not operate if “
” is displayed.
Beep tone on / off
When time is displayed, touch +/ST/SP to activate / deactivate beep tone. 
indicates beep tone is deactivated.
Replace battery
If the battery power of your watch is low, the watch will display 
.
To replace watch battery:
1. Use a coin to open the battery compartment lid by turning it anticlockwise.
2. Remove the old battery and insert a new CR2025, 3V lithium battery.
3. Secure the lid by turning the coin clockwise.
IMPORTANT Remember to set the profiles after every battery replacement or reset.
Water resistance
The SE338 / SE338M is
| RAIN | SHOWERING | LIGHT | SHALLOW | SNORKELING/ | |
| SPLASHES | (WARM / | SWIMMING/ | DIVING / | DEEP WATER | |
| ETC | COOL WATER | SHALLOW | SURFING/ | DIVING | |
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| ONLY) | WATER | WATER |
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| SPORTS |
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50M / | OK | OK | OK | OK | NO | |
164 FT | ||||||
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•Ensure the buttons and battery compartment are secured and intact before exposing the watch to excessive water.
•Avoid pressing the buttons while in the water or during heavy rainstorms, as this may cause water to enter the watch, leading to malfunction.
Specifications
CLOCK
Time format | 12/24 hour format with hour / minute |
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Date format | DD.MM.YY or MM.DD.YY |
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Year range | 2010 - 2059 |
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TRAINING |
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Target heart rate zone | |
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Maximum memory | 99 records |
Calorie range | 0 to 9,999 kcal |
POWER |
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Watch | 1 x CR2025 3V lithium battery |
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OPERATING ENVIRONMENT |
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Operating temperature | 32˚F to 104˚F |
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Storage temperature | |
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Precautions
To ensure you use your product correctly and safely, read these warnings and the entire user manual before using the product:
•Should the unit experience an electrostatic discharge, it may trigger the watch to change modes or displays. Simply touch MODE/- to exit or to toggle back to previous display. This is normal.
•Use a soft, slightly moistened cloth. Do not use abrasive or corrosive cleaning agents, as these may cause damage. Use luke warm water and mild soap to clean the watch thoroughly after each training session. Never use the products in hot water or store them when wet.
•Do not subject the product to excessive force, shock, dust, temperature changes, or humidity. Never expose the product to direct sunlight for extended periods. Such treatment may result in malfunction.
•Do not tamper with the internal components. Doing so will terminate the product warranty and may cause damage. The main unit contains no
•Do not scratch hard objects against the LCD display as this may cause damage.
•Take precautions when handling all battery types.
•Remove the batteries whenever you are planning to store the product for a long period of time.
•When replacing batteries, use new batteries as specified in this user manual.
•The product is a precision instrument. Never attempt to take this device apart. Contact the retailer or our customer service department if the product requires servicing.
•Do not press the exposed electronic circuitry, as there is a danger of electric shock.
•Check all major functions if the device has not been used for a long time. Maintain regular internal testing and cleaning of your device. Have your watch serviced by an approved service center annually.
•When disposing of this product, ensure it is collected separately for special treatment and not as normal household waste.
•Due to printing limitations, the displays shown in this manual may differ from the actual display.
•The contents of this manual may not be reproduced without the permission of the manufacturer.
NOTE The technical specifications for this product and the contents of the user manual are subject to change without notice.
NOTE Features and accessories will not be available in all countries. For more information, please contact your local retailer.
About Oregon Scientific
Visit our website (www.oregonscientific.com) to learn more about Oregon Scientific products.
If you’re in the US and would like to contact our Customer Care department directly, please visit: https://us.oregonscientific.com/service/support.asp
For international inquiries, please visit: https://us.oregonscientific.com/about/international.asp
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