Apple Watch Series 6 40mm watches
27 Deals
Overview
The Apple Watch Series 6 40mm launched in 2020 and remains a strong choice for buyers who want a compact, capable smartwatch. Choosing a pre-owned Series 6 can save you money compared with the original retail price while still delivering key Apple features like health sensors, fast performance and a sharp display.
What sets the Series 6 apart?
- Blood oxygen sensor (SpO2) — measures blood oxygen levels to give extra insight into overall health and fitness.
- ECG capability — lets the watch record an electrocardiogram and can help identify irregular heart rhythms.
- Always-On Retina display — quick glances at time and complications without raising your wrist; brighter than earlier models.
- S6 processor — faster app launches and snappy performance for everyday use.
- Built-in GPS and optional Cellular — GPS models track routes and distance; Cellular models let you stay connected without your phone nearby.
- Water resistance to 50 m — suitable for swimming and everyday wear.
Quick specs to consider
- Size: 40 mm case (also available in 44 mm)
- Battery: around 18 hours typical usage
- Connectivity: Bluetooth, Wi‑Fi, GPS; optional LTE on cellular models
- Health: heart rate, ECG, SpO2, fall detection
- Compatibility: pairs with iPhone and runs current watchOS releases (see seller for exact watchOS and iPhone requirements)
Products in the same Apple Watch family
Series 6 sits among many Apple Watch models. Related options you can explore while you compare pre-owned finds include the Apple Watch SE 40mm, the Apple Watch SE 44mm and earlier or newer Series models like Apple Watch Series 5 and Apple Watch Series 7. You can also browse the full Apple smartwatches category for more options.
How Series 6 compares with nearby models
| Model | Launch year | Key differences | Best for |
|---|---|---|---|
| Apple Watch Series 6 40mm | 2020 | SpO2 sensor, faster S6 chip, brighter always-on display | Buyers who want health sensors plus speed in a compact case |
| Apple Watch SE 40mm | 2020 | No SpO2 or ECG, lower price | Budget conscious users who still want core Apple Watch features |
| Apple Watch Series 5 | 2019 | Introduced Always-On display; no SpO2 | Users who prioritise display and price over newest sensors |
Buying guide and things to consider
Which size is right?
The 40 mm is a good fit for smaller wrists or anyone who prefers a lighter watch. If you want a larger screen or longer battery for heavy use, look at 44 mm or later Series models.
Battery and performance
Pre-owned battery capacity varies. As you discover second-hand options, look at seller descriptions for battery health or estimated hours of use. The S6 chip keeps the watch feeling responsive for apps, navigation and fitness tracking.
WatchOS updates and compatibility
Apple provides watchOS updates for several years. When you compare pre-owned alternatives, check which watchOS version the device supports and whether your iPhone model is compatible.
Condition and seller details
Use filters such as price and condition to narrow options. Product pages on partner sites list exact condition, included accessories and delivery information. Click through to the seller site to see full listing details and to complete your purchase.
Price range
There are currently available pre-owned products priced between 110 and 286.
Frequently asked questions
Is a used Apple Watch Series 6 still a good buy?
Will the Series 6 receive future watchOS updates?
Can I use my existing watch bands?
Tips from experienced buyers
- Filter by price and condition to compare similar listings.
- Prefer listings that include original charger or note battery health.
- Choose a seller with clear delivery terms and return policy for peace of mind.
Find and buy Apple Watch Series 6 40mm watches via Relovie – the largest collection of pre-owned and refurbished electronics online.