Polar M400 vs. Fitbit Flex 2 vs. Jaybird Reign vs. Apple Watch Series 4 vs. Apple Watch 7
 | | | | | |
| PolarM400Remove Buy Now | FitbitFlex 2Remove Buy Now | JaybirdReignRemove Buy Now | AppleWatch Series 4Remove Buy Now | AppleWatch 7Remove Buy Now |
Basic Info | |||||
| Suggested Price | $200 | $100 | $150 | $329 | $429 |
| Release | 2014 | 2016 | 2015 | 2018 | 2021 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | n/a | ||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 8 hours to 30 days | 5 days | 5 days | Not Yet | 18 Hours |
| Rechargeable | |||||
Compatibility | |||||
| Android | |||||
| iOS | |||||
| Windows Phone | n/a | n/a | NA | ||
| Mac | NA | ||||
| Windows | NA | ||||
Connectivity | |||||
| Bluetooth | |||||
| Cellular | |||||
| GPS | |||||
| NFC | |||||
| Wi-Fi | |||||
Display | |||||
| Color | n/a | ||||
| Resolution | n/a | n/a | NA | 384 x 480 | 396 x 484 |
| Size | n/a | n/a | NA | 1.78 inches | 1.9 inches |
| Touch | n/a | NA | |||
| Type | n/a | LED | LED | MicroLED | MicroLED |
Functions | |||||
| Audio Speaker | Alerts only | ||||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 3 ATM | 5 ATM | NA | Not Yet | water resistant but not waterproof |
Notifications | |||||
| Phone | |||||
| Emails | |||||
| Texts | |||||
Software | |||||
| Operating System | n/a | n/a | NA | Watch OS 5 | WatchOS 8 |
| Apps | |||||
| Music | |||||