Apple unveiled new models of Apple Watch, iPad, and other products during its virtual September event on Tuesday.

The company's new versions of iPhone, however, are expected to be launched next month, according to an earlier Bloomberg report.

The latest Apple Watch Series 6 can measure users' blood oxygen level, and iPad Air features an all‑screen design with a new A14 Bionic chip.

Apple also announced Apple One, a plan to include all of Apple services, including Apple Music, Apple TV+, Apple Arcade and further iCloud storage into one subscription.

"Apple Watch SE combines elements of the Series 6 design with the most essential features of Apple Watch, all at a more affordable price," said Jeff Williams, Apple's chief operating officer.

Apple Watch SE features the same accelerometer, gyroscope, and always-on altimeter as Apple Watch Series 6, and with the latest motion sensors and microphone. It offers robust health and safety capabilities including fall detection, Emergency SOS, international emergency calling, and the Noise app, the company said.

With the S5 System in Package (SiP) and a dual-core processor, Apple Watch SE features a Retina display that is 30 percent larger than Series 3, according to Apple.

The Apple Watch SE is made of 100 percent recycled aluminum, and compatible with Apple Watch bands, the company said.

Starting at $279, Apple Watch SE will be available on Friday, Sept 18, in three case finishes.

Apple Watch Series 6 can measure the oxygen saturation of the user's blood, so the users may better understand their overall fitness and wellness.

To compensate for natural variations in the skin and improve accuracy, the Blood Oxygen sensor employs four clusters of green, red, and infrared LEDs, along with the four photodiodes on the back crystal of Apple Watch, to measure light reflected back from blood, the company demonstrated.

Apple Watch uses a custom algorithm built into the Blood Oxygen app to measure blood oxygen between 70 percent and 100 percent.

The new Apple Watch's new hardware improvements include a faster S6 System in Package (SiP) and an always-on altimeter.

Its new operating system "watchOS 7" also brings new features such as Family Setup, sleep tracking, automatic handwashing detection, new workout types, and the ability to curate and share watch faces, the company said.

Using a new dual-core processor based on A13 Bionic in iPhone 11, the upgraded S6 SiP runs up to 20 percent faster while maintaining the same 18-hour battery life, according to Apple.

The new Apple Watch will be available on Friday, Sept 18, starting at $399.