| key specs |
| Strap Colour | Grey | - |
| Display Size | 36mm | 36mm |
| Strap Material | Stainless Steel | - |
| Dial Shape | Round | Round |
| Display Type | AMOLED | AMOLED |
| Ideal For | Men | Unisex |
| Compatible OS | - | Android 8.0 or above, iOS 12.0 or above |
| general |
| Brand | Fastrack | Xiaomi |
| Model | Revoltt FR2 Pro | Watch S4 15th Anniversary Edition |
| Model Number | 38156QM01 | - |
| Model Name | Revoltt FR2 Pro | Xiaomi Watch S4 15th Anniversary Edition |
| Dial Shape | Round | Round |
| Strap Colour | Grey | - |
| Strap Material | Stainless Steel | - |
| Touchscreen | Yes | 1.43 |
| Water Resistant | Yes | 5 ATM |
| Water Resistance Depth | 1.5 m | - |
| Usage | Fitness & Outdoor | Regular |
| Ideal For | Men | Unisex |
| Release date | - | May 23, 2025 |
| Dial Colour | - | Black |
| Size | - | Regular |
| Interchangeable Strap | - | Yes |
| dimensions |
| Weight (g) | 117.00 | 44.50 |
| Width | - | 47.3 |
| Height | - | 47.3 |
| Thickness | - | 12 |
| product details |
| Sensor | Accelerometer | Heart Rate Monitor, Stress, Sleep |
| Notification | Call Notifications , Call Answer & Reject, Call Mute, Social Media Notifications, SMS Notifictaions, Other App Notification | - |
| Notification Type | Ring, Vibration | - |
| Battery Type | Lithium Polymer | 486mAh |
| Battery Life | 5 Day | - |
| Charge Time | 120 min | - |
| Charger Type | Pogo Pin Charging Cable | - |
| Rechargeable Battery | Yes | - |
| Compatible Device | - | Android and iOS |
| connectivity features |
| Call Function | Yes | - |
| Bluetooth | Yes | Yes |
| Bluetooth Version | V5.3 | 5.3 |
| Messaging Support | Yes | - |
| Operating Range | 10 m | - |
| Call Features | Call Answer, Call Reject, Call Mute, Call Notifications, Quick Replies (Android) | - |
| Wi-Fi | - | Yes |
| GPS | - | Yes |
| Other Connectivity Features | - | NFC, Galileo, Glonass, Beidou, QZSS |
| platform and storage features |
| RAM | 128MB | - |
| Operating System | - | HyperOS 2 |
| Compatible Operating System | - | Android 8.0 or above, iOS 12.0 or above |
| camera and display features |
| Display Resolution | 466x466 Pixel | 466 x 466 |
| Display Size | 36mm | 36mm |
| Display Type | AMOLED | AMOLED |
| fitness and watch functions |
| Step Count | Yes | Yes |
| Calorie Count | Yes | Yes |
| Heart Rate Monitor | Yes | Yes |
| Compass | No | - |
| Calendar | Yes | - |
| Alarm Clock | Yes | Yes |
| Language | English | English |
| Other Watch Functions | Calculator, AI Voice Assistant, One Click Measurement with 24x7 HRM, Auto Stress Monitor, SpO2 and Sleep Monitor with REM, Music and Camera Control, Built-In Games, Alarm, Stopwatch and Timer,Functional Crown | - |
| Date & Time Display | - | Yes |
| audio and video features |
| Speaker | Yes | - |
| Microphone | Yes | - |
| Voice Control | Yes | - |