Technical Specification of Redmi Watch 4 Smartwatch

 Display

• Type: AMOLED

• Size: 1.97 inches

• Shape: Square

• Refresh Rate: 60Hz

• Technology: LTPS 5Hz

• Brightness: Up to 600 nits

• Note: 26% increase in display area compared to previous models

Dimensions and Weight

• Height: 47.5mm

• Width: 41.1mm

• Thickness: 10.5mm

• Weight: 31.5g (without strap)

• Note: Dimensions exclude strap and protrusions

Build and Design

• Frame Material: Aluminum alloy

• Colors Available: Two classic colors (specific names not provided)

• Crown: Stainless steel rotating crown

• Strap Attachment: Next-gen quick-release structure for easy strap replacement

Water Resistance

• Rating: 5ATM

• Suitable for: 18 aquatic sports

• Feature: Automatic water drainage function

Straps

• Default Options:

  1. Obsidian Black: TPU material, size 135mm ~ 205mm

  2. Silver Gray: TPU material, size 135mm ~ 205mm

• Note: Additional strap options available separately

Battery

• Capacity: 470mAh

• Battery Life:

• Typical Usage Mode: 20 days

• AOD (Always-On Display) Mode: 10 days

• Long Battery Mode: 30 days

• Charging: Portable magnetic charging

Sensors

• Heart Rate Sensor: 4-channel PPG sensor configuration (includes blood oxygen sensor)

• Motion Sensors:

  • Accelerometer

  • Gyroscope

• Environmental Sensors:

  • Ambient Light Sensor

• Navigation: Electronic Compass

Positioning Systems

• Built-in GNSS chip

• Supported Systems: GPS, Galileo, Glonass, BeiDou, QZSS

Connectivity

• Bluetooth: Supported (version not specified)

• Bluetooth Calling: Supported with built-in microphone and speaker

User Interface

• Input: Touchscreen and rotating crown

• Customization: 200+ stylish watch faces available

Health and Fitness Features

• Heart Rate Monitoring: Continuous, all-day monitoring

• Blood Oxygen Saturation (SpO2) Monitoring: All-day monitoring with low oxygen alerts

• Sleep Monitoring: Tracks sleep stages (deep sleep, light sleep, REM)

• Stress Monitoring: Continuous with breathing exercise prompts

• Sports Modes: 150+ modes including outdoor/indoor running, walking, cycling

• Workout Features:

  • Independent satellite positioning for route tracking

  • Pre-workout warm-up guides with motion pictures

Additional Features

• Notifications: Call, message, and app notifications

• Emergency SOS: Quick triple-press of crown button to alert emergency contacts

• Data Sync: Compatible with Mi Fitness app, Strava, and Apple Health

Package Contents

• Redmi Watch 4

• Magnetic charging cable

• User Manual (including warranty notice)

System Compatibility

• Requires smartphone with Android 6.0 or iOS 12.0 and above