Apple just released 2 brand new Apple Watches today — here are the biggest differences between them

The Apple Watch Series 6 (left) and Apple Watch SE (right).Lisa Eadicicco/Business Insider

• Apple is launching two new Apple Watches on Friday: the $400 Apple Watch Series 6 and $280 Apple Watch SE.
• The Apple Watch Series 6 is Apple's new high-end watch, while the SE is a more affordable version.
• The Series 6 comes with a blood oxygen reader, the ability to take an ECG, and an always-on display, unlike the SE.

In typical Apple fashion, the company made a slew of product announcements during its annual September event, unveiling two new Apple Watches, two iPads, and digital services.

The anticipated iPhone 12 was nowhere to be found, but the company did provide a glimpse at what's next for the Apple Watch.

The $400 Apple Watch Series 6 and $280 Apple Watch SE both launched on Friday after going up for preorder on Tuesday. The Series 6 is Apple's next flagship watch that comes with the ability to take blood oxygen measurements among other improvements.

The Apple Watch SE is a cheaper version that comes with the same processor as last year's Series 5 and offers more features than the $200 Series 3, but doesn't come with as many advanced health features as the Series 6.

Here's a closer look at the biggest difference between the two.