Here are key features of the official stylus (commonly sold as the “Redmi Smart Pen”):
• Pressure sensitivity up to 4,096 levels.
• Very low latency (e.g., ~5 ms) and high touch sampling rate (240 Hz) when paired with compatible tablets.
• Additional features: tilt support (for drawing), shortcut buttons, and a well-integrated experience with certain Redmi/Xiaomi tablets.
• Designed as an active stylus (not just a generic capacitive pen) — meaning it communicates more deeply with the device (digitizer, etc).
• Frequently sold separately (not bundled with tablets) and aimed at users doing drawing, note-taking, annotation rather than just casual use.