SAMSUNG SM R840 Galaxy Watch 3 45mm Stainless Steel Silver

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From the manufacturer

Galaxy Watch3

Bigger display, Yet lighter and slimmer for comfort wear

Dignified Design

Outlined in a subtle rotating bezel, it’s easier to see and focus on what matters with an even bigger screen. Galaxy Watch3 is thinner and smaller, yet about 15% lighter with a sophisticated look that’s ideal for your wrist with its slimmed-down frame.

*Figures compare the Galaxy Watch3 45mm Stainless Steel and Galaxy Watch 46mm Stainless Steel models. There may be differences in measurements based on the position measured.

Your key health information is at your fingertips with Samsung Health Monitor

Blood Pressure


Blood Oxygen

Monitor and track your blood pressure

Blood Pressure

Check your blood pressure via the Samsung Health Monitor App without regularly needing a cuff. Before first use simply calibrate with a cuff, then smart sensors measure your blood pressure through pulse wave analysis as you wear it. Check it daily to track trends and get reports right on your phone.

*For accurate BP readings, monthly calibration required by GP or BP monitor & arm cuff. **ECG and BP feature only to be used by 22 years+. ***Requires a Galaxy smartphone running Android 7.0 or above.

Follow your heart rhythm with ECG monitoring


Touch the watch’s back button for up to 30 seconds to have its built-in electrode sensor measure your heart rhythm. This ECG on the go tests for atrial fibrillation (Afib), then shows your measurements at a glance. See results over time from your phone, get the report, and share for more insights.

*ECG and BP feature only to be used by 22 years+. **Requires a Galaxy smartphone running Android 7.0 or above.

Breathe easier with built-in oxygen measurement

Blood Oxygen

Galaxy Watch3 uses red LED and infrared rays to estimate your SpO2 levels or the amount of oxygen in your bloodstream. Because this oxygen saturation is directly linked to physical performance, you can use Galaxy Watch3 to push your routine to the next level.

*SpO2 is defined as saturation of percutaneous oxygen. Normal levels in humans are measured at approximately 95-100%. Factors like vigorous exercise, the amount of oxygen in the air, your elevation, and various health conditions can all result in lower readings.

Fall detection

Sleep score

Running analysis

Fall detection that won’t fall down on the job

Fall Detection

Explore fearlessly. Galaxy Watch3 automatically detects hard falls with its enhanced accelerometer, sending an SOS to your emergency contact with your location.

*Galaxy Watch3 can initiate an Emergency call and message if you take a hard fall and don’t seem to move. **Galaxy Watch3 cannot detect all falls. ***The more physically active you are, the more likely you are to trigger Fall Detection due to high impact activity that can appear to be a fall. ****Sending SOS calls and messages requires network connection and smartphone pairing.

Get a better night’s sleep

Sleep Score

Galaxy Watch3 records your REM cycles, deep sleep, and total sleep time to score and help improve the quality of your rest. Samsung partnered with the National Sleep Foundation to include educational content and sleep tips right on your device, to help you understand and improve your sleep.

*Sleep management functions (REM cycles, deep sleep, and total sleep time) on the watch can be used as standalone, but smartphone pairing is recommended in order to see sleep score. Insight only available on paired smartphone.

Improve every stride

Running Analysis

Galaxy Watch3’s running guide lets you keep pace as you get tips on the go. The advanced algorithm analyzes how you move to help improve your form and prevent injuries. You can even measure VO2 max values and keep up with your daily, weekly, and monthly performance right from your phone.

*Detailed chart only available on paired smartphone.

Smartphone-level power is now within reach

Auto Chat History

Smart Reply



Keep the conversation going

Auto Chat History

When you get a new text, Galaxy Watch3 shows your chat history so you can effortlessly follow the conversation. You can also see images without an extra tap, making it even easier to keep the mood going while on a run.

*Supported messaging apps may vary by country or region. **Wi-Fi/LTE connection is required on Galaxy Watch3 and feature requires pairing with smartphone.

Add a little context with smart reply

Smart Reply

Stay connected with others even on the go – and without fumbling to reply. Galaxy Watch3’s smart reply analyzes texts and photos you receive and gives you suggested replies, supporting different categories that include food, celebrations, selfies, and more.

*Feature supports nine languages: Korean, English, German, Spanish, Italian, French, Russian, Ukrainian, and Polish.**Wi-Fi/LTE connection is required on Galaxy Watch3 and feature requires pairing with smartphone.

More fun in your messages


Bitmoji stickers open up fun new ways to communicate. Personalize your Bitmoji to look just like you and use Bitmoji stickers to jazz up the way you talk to family and friends.

*Sending Bitmoji stickers requires Bitmoji app version 10.84 or later. **Bitmoji feature is only supported on the Message app. ***Service availability may vary by country or region. ****Wi-Fi/LTE connection is required on Galaxy Watch3 and feature requires pairing with smartphone.

Leave your phone at home


Go out for new experiences without the weight of your phone. You can still call, stream, and check your steps — all from your watch. Disconnect from your phone, while staying connected with life.

*LTE feature only available on LTE models. **Availability of LTE model may vary by carrier or country.

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