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Samsung Galaxy Watch 4, 44mm, Black - Water Resistant, Wireless smartwatch, Sport Band, Wi-Fi/Bluetooth only - SM-R870NZKCXAA (Renewed)

  • Based on 946 reviews
Condition: Refurbished - Excellent
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Availability: 15 left in stock
Fulfilled by Amazon
Arrives Thursday, Jul 23
Order within 13 hours and 57 minutes
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Features

  • Fitness / Auto Workout Tracking: Make the most of every workout with Auto Workout Tracking. Stay motivated by connecting to live coaching sessions via your smartphone or to dynamic group challenges with your friends.
  • Fitness / Auto Workout Tracking: Make the most of every workout with Auto Workout Tracking. Stay motivated by connecting to live coaching sessions via your smartphone or to dynamic group challenges with your friends.
  • Advanced Sleep / Continuous SpO2: Wake up feeling refreshed and recharged every day with advanced sleep tracking. When you go to bed, the sleep tracker on your Galaxy Watch4 starts monitoring your sleep and SpO2 levels continuously. This info is combined with snoring assessments captured on your smartphone to help you figure out how to improve your overall sleep quality.
  • Extension of your phone: Galaxy Watch4 puts the phone features you need right on your wrist, so you can do the things you love on the go without pulling out your phone. Whether youre running, power-lunching or checking off your to-do list, youre connected to calls, texts, notifications and music streaming, all accessible with a simple tap.
  • Sleek and lightweight design: Look great while crushing your day with the sleek, lightweight and customizable Galaxy Watch4. Combining fashion and function, its made to move with you while working out, and it matches your mood and your outfit with bands ranging from green, silver, pink and black, plus a variety of watch faces.

Description

Cosmetic Condition: Excellent Screen: No scratches Body: No signs of cosmetic damage (scratches, dents, and other) are visible when the product is held 12 inches away. Functional Condition: Fully Functional Battery: >80% of original battery life Accessories: Generic or original equipment manufacturer accessories and packaging provided. Guarantee: 90-day Amazon Renewed Guarantee

Operating System: android


Memory Storage Capacity: 16 GB


Special Feature: Blood Pressure Monitor, Time Display, Notifications, Sleep Monitor, Text Messaging, Heart Rate Monitor See more


Battery Capacity: 430 Milliamp Hours


Connectivity Technology: Bluetooth


Wireless Communication Standard: Bluetooth


Battery Cell Composition: Lithium Ion


GPS: Built-in GPS


Shape: Round


Screen Size: 44 Millimeters


Operating System: android


Additional Features: Blood Pressure Monitor, Time Display, Notifications, Sleep Monitor, Text Messaging, Heart Rate Monitor


GPS Geotagging Functionality: Built-in GPS


Band Material Type: Silicone


Case Material Type: Aluminum


Water Resistance Level: Water Resistant


Sport Type: Fitness, Running


Human Interface Input: Touchscreen


Clasp Type: Tang Buckle


Supported Application: Multisport Tracker, Reminders


Supported Satellite Navigation System: GPS


Controller Type: Touchscreen


Metrics Measured: Accelerometers, Optical Heart Rate Sensors, ECG Sensors, SpO2 Sensors


Closure Type: Buckle


Battery Capacity: 430 Milliamp Hours


Battery Cell Type: Lithium Ion


Battery Average Life: 40 Hours


Connectivity Technology: Bluetooth


Wireless Compability: Bluetooth


Wireless Provider: Unlocked for All Carriers


Cellular Technology: 4G LTE


Communication Feature: Bluetooth


Band Width: 0.79 Millimeters


Item Dimensions: 6 x 4 x 4 inches


Band Length: 0.79 Millimeters


Warranty Type: Limited


Waterproof Rating: IPX4


EU Spare Part Availability Duration: 90 Days


Brand: Samsung


Model Name: Galaxy Watch 4


Target Audience: Unisex Adults


Age Range Description: Adult


Model Number: SM-R870


Built-In Media: charger


Wearable Computer Type: Smart Watch


UPC: 795044517194


Manufacturer: Samsung


Shape: Round


Style Name: Classic


Color: Black


Band Color: black


Screen Size: 44 Millimeters


Display Type: Analog


Resolution: 360 x 360


Compatible Devices: Smartphone


Compatible Phone Models: Compatible with iOS and Android devices


Memory Storage Capacity: 16 GB


RAM Memory Installed: 1.5 GB


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jul 23

Yes, absolutely! You may return this product for a full refund within 90 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Just great Just great
Review Image by Matthew
First, looks. It's super sleek and modern unlike the toyish appearance of the apple watch or fit bit alternatives. It's super comfortable and I find it easy to wear all day (unlike other watches I've had). It's also really sturdy. I've smacked it on many things by accident, and not a scratch on it. The band is super comfortable and I like the material on that. Let's talk about functionality: The battery life is pretty good. Not the best but I'd say I charge it up around once every 2 days. You can also improve the battery life by disabling unnecessary features but that depends on your preferences. Pixel watch face is a great watch face that, in my opinion, looks better than any of the official faces and saves battery life by being black in color (plus it's super cheap, way worth it). The features are amazing. So much more than what you get from the competition, including the ability to install ANY apk (yes any, I put minecraft on this thing) with some technical knowhow. The fitness tracking is great, it even detect what type of exercise you're doing, and the fact that things like google maps are built in is fantastic. Taking/making calls and texts is easy and nice as well. TLDR: if you need a smart watch and you have a Samsung device, there is no better option, especially at this price point. Well worth the money! ... show more
Reviewed in the United States on July 19, 2022 Reviewed in the United States on July 19, 2022 by Matthew
    • Little badass watch!
I bought this watch preowened, I never owned a smart watch until this product. Im not going to lie this watch is a tank! I do reccommend 44mm screen protectors! The battery life is great I wear it everywhere. Only thing is charging it is wireless there has been somedays where I didn't place it corretly on the charger woke up to low battery, but it still gets the job done. I am outdoor person so have even been fully submurged lakes there was no damage at all I take showers with it and no damage. I've also use this watch while mountain biking and I've slammed with it on still works! The outside the screeen glass metal has some wear on it, but I think it gives it flare like Boba Fetts armor. I bougth this watch to keep track of my fitness and has a bunch of great features and there is also one where you can use the watch to take pictures hands free! Lastly for my nerds yes I have downloaded the Fallout Pipboy watch screen on it pretty cool! ... show more
Reviewed in the United States on March 13, 2025 by Mr. Grant
    • Works great
Works great with our android phone, not problems with it at all
Reviewed in the United States on April 25, 2026 by Alicia LaPorte
    • Best alternative to the Apple Equivalent Brand
I researched watches of this sort quite extensively, before making the purchase. I use Samsung devices and do NOT want Apple in my life. That being said.. My last watch would hold a charge for 2 weeks, before requiring a charge. This watch requires tweaking, in order to stay charged for several days in a row. There is a power-saving feature. If you do not have it turned on, your watch will need to be charged within 1-1.5 days. I try to charge my watch frequently and during the day, so that I can record my sleep patterns at night. It's pointless to charge your while you sleep, if you got it with the expressed purpose of recording your sleep patterns. You will need to install the Samsung Health app and Galaxy Wearable app, in order to see all of the data tracked by your watch and look at the analytics captured over time. However, being connected to your phone via Bluetooth will drain your watch. And it's very easy to mistakenly connect to your watch while trying to connect to your Samsung pods, for example. I often find that my watch was connected, even though I had not intended that. And, yes, it inevitably drains your watch battery. So, the only way to ensure that your watch is not being drained is to keep your phone Bluetooth turned off. This has been a huge pain. I wish that the power save feature would keep me disconnected from Bluetooth, but it does not. All in all, assuming that you're willing to adjust your daily routine to accommodate the charging needs of the Samsung watch, it's a great watch, likely the best alternative to the substantially more expensive alternative Apple watch. ... show more
Reviewed in the United States on July 25, 2023 by Joe Bohn
    • Bang For My Buck!!
When I first got the watch, the display looks amazing and it is 60 hz, which is insane for a cheap watch. How much was it? I setted it up pretty easily. Just a samsung phone and that's it. Literally $35! I got so much frickin features for that price so cheap. It has Bluetooth, NFC and Google Pay. I used that app to pay for food and it worked well. Also, it has a sapphire glass and it's durable as heck. It has all of the modern smartwatch features for literally $35!! How crazy is that!? ... show more
Reviewed in the United States on May 8, 2026 by brian caballero
    • Like new
As others have mentioned, this watch came in the original box but the box was beat up. The watch itself is like new and if not for 1 tiny nick on the underside of the case that you can't even see while wearing it, you'd never know this was "renewed". For the actual watch, I replaced my aging Fitbit versa 1 and won't go back. I like the look of this watch better and because of WearOS, it has much more options. Sleep tracking isn't always correct for my wake up time unless I actually go into the sleep menu when I wake up so it knows to stop tracking if I'm just laying in bed scrolling through my phone before I get up. It's annoying but I've basically come up with a routine now that I set it for bedtime mode at night and when I wake up, turn off bedtime mode (which is really just DND and disables the screen from waking up with movement) and then immediately swipe over to the sleep screen. It is what it is. For all the other features, it works great and has a lot of options. Battery life improved for me after using it for about a week or 2. I get about 2.5 days out of it but usually throw it on the charger when I wake up for about a half hour while I get ready for the day. ... show more
Reviewed in the United States on July 8, 2022 by James
    • Not What Expected. Not What Expected.
Review Image by Adonis
Can't seem to update the watch, touch functionality fails in specific areas, and seems to lag quite a bit. It freezes up and I am not satisfied. Currently seems to be stuck with screen shown attached. I've attempted to update it since last night after receiving in the morning. Not satisfied.
Reviewed in the United States on November 26, 2025 Reviewed in the United States on November 26, 2025 by Adonis
    • Healthtracking
Great buy. Different programmable faces
Reviewed in the United States on May 27, 2026 by Corey Phillips

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