Adonit Snap 2 Bluetooth Selfie Touch Pen with Remote Shutter with Magnetic Strip Stylus Compatible for iPhone 13/13 Pro Max/ 13 Pro/12/12 Pro MAX/11/X/XR/8/8Plus, Samsung Galaxy/Fold/Flip/Note/S -Pink : Amazon.sg: Electronics
Adonit Snap 2 is a stylus for iOS and Android that has a camera button
Review: Adonit Snap 2 stylus (tested on iOS and Android) - YouTube
Amazon.com: Customer reviews: Adonit Snap 2 Bluetooth Selfie Touch Pen with Remote Shutter with Magnetic Strip Stylus Compatible for iPhone 11/Pro Max/X/XS/XR, Samsung S9/10/Note+, iPad/Air/Mini & Newer - Blue