| key specs |
| Strap Colour | Black | Carbon, Lunar White |
| Display Size | 34mm | - |
| Compatible OS | Android, iOS | Android, iOS |
| Dial Shape | Round | Square |
| Display Type | AMOLED | AMOLED |
| Ideal For | Unisex | Unisex |
| general |
| Brand | Fire-Boltt | Fitbit |
| Model | Invincible | Sense |
| Release date | October 1, 2021 | August 25, 2020 |
| Model Number | BSW020 | - |
| Model Name | Invincible | Sense |
| Dial Shape | Round | Square |
| Size | Regular | Regular |
| Touchscreen | Yes | Yes |
| Water Resistant | IP67 | Yes |
| Ideal For | Unisex | Unisex |
| Strap Colour | Black | Carbon, Lunar White |
| Water Resistance Depth | - | 50 meters |
| dimensions |
| Width | 45 | - |
| Height | 45 | - |
| Thickness | 11 | - |
| Weight (g) | 51.00 | - |
| product details |
| Sensor | Accelerometer Sensor, Barometer Sensor, Gyro Sensor, Light Sensor, Optical Heart Rate Sensor, SpO2 Sensor | Multi-path optical heart rate sensor, Multipurpose electrical sensors compatible with EDA Scan app, Gyroscope, Altimeter, 3-axis accelerometer, Skin temperature sensor, Ambient light sensor |
| Compatible Device | Android, iPhone | Mac OS X 12.2 and up, iPhone 5S and later, iPad 5 gen. and later, Android 7.0 and later |
| Notification | Yes | - |
| Battery Life | 7 days | Around 6 days |
| Charge Time | 2 hours | - |
| Charger Type | Magnetic | - |
| Stand By Time | 15 days | - |
| Rechargeable Battery | Yes | - |
| Battery Type | - | Lithium-polymer |
| connectivity features |
| Call Function | Yes | Yes |
| Bluetooth | Bluetooth | Yes |
| Bluetooth Version | 5.0 | 5 |
| Wi-Fi | - | Yes |
| GPS | - | Yes |
| Other Connectivity Features | - | NFC |
| platform and storage features |
| Compatible Operating System | Android, iOS | Android, iOS |
| camera and display features |
| Display Resolution | 454x454 | - |
| Display Size | 34mm | - |
| Display Type | AMOLED | AMOLED |
| Other Display Features | Always-On Display | - |
| fitness and watch functions |
| Step Count | Yes | Yes |
| Calorie Count | Yes | Yes |
| Heart Rate Monitor | Yes | Yes |
| Calendar | Yes | Yes |
| Alarm Clock | Yes | Yes |
| Date & Time Display | Yes | Yes |
| Language | English | English |
| Other Fitness Features | 100 sports modes | - |
| Other Watch Functions | 8GB storage, 100 watch faces, calculator, TWS Connect, Quick Dial, flashlight | - |
| Altimeter | - | Yes |
| audio and video features |
| Speaker | Yes | Yes |
| Microphone | Yes | Yes |
| Other Multimedia Features | music control, camera control | - |