The iPhone 6s Plus is a smartphone model produced by Apple Inc. It was released in September 2015 and served as an upgraded version of the iPhone 6 Plus. Here are some key features and details about the iPhone 6s Plus:

1. Design and Display: The iPhone 6s Plus features a 5.5-inch Retina display with a resolution of 1920 x 1080 pixels. It has a metal unibody design with rounded edges and is available in various color options, including Space Gray, Silver, Gold, and Rose Gold.

2. Performance: The iPhone 6s Plus is equipped with Apple's A9 chip, which provides improved performance and energy efficiency compared to its predecessor. It also has an M9 motion coprocessor for enhanced motion tracking and sensor capabilities.

3. Camera: The iPhone 6s Plus features a 12-megapixel rear camera with optical image stabilization, autofocus, and the ability to record 4K videos. It also has a 5-megapixel front-facing camera for selfies and FaceTime calls.

4. 3D Touch: One of the notable features introduced with the iPhone 6s Plus is 3D Touch. It allows the display to sense different levels of pressure, enabling users to access additional features and shortcuts by pressing harder on the screen.

5. Touch ID: The iPhone 6s Plus includes Touch ID, Apple's fingerprint recognition technology, which allows you to securely unlock your device and authenticate various actions such as making purchases or accessing sensitive information.

6. Storage Options: The iPhone 6s Plus is available in different storage capacities, including 32GB, 64GB, and 128GB. However, please note that the availability of specific storage options may vary depending on the region and the time of purchase.

7. Operating System: The iPhone 6s Plus originally shipped with iOS 9 and has since received multiple iOS updates. However, it's worth noting that software support for older iPhone models may eventually end as newer iOS versions are released.

8. Battery Life: The iPhone 6s Plus generally offers good battery life, capable of lasting through a day of moderate usage. However, battery performance can vary depending on individual usage patterns and settings.

It's important to note that as technology evolves, newer iPhone models with more advanced features and improved performance have been released since the iPhone 6s Plus. However, the iPhone 6s Plus still remains a viable option for users seeking a larger display, solid performance, and features like 3D Touch and a capable camera.