Polar M400 vs. TomTom Adventurer vs. Xiaomi Mi Band 2 vs. Fitbit Charge HR vs. Apple Watch Series 4
 | | | | | |
| PolarM400Remove Buy Now | TomTomAdventurerRemove Buy Now | XiaomiMi Band 2Remove Buy Now | FitbitCharge HRRemove Buy Now | AppleWatch Series 4Remove Buy Now |
Basic Info | |||||
| Suggested Price | $200 | $350 | $23 | $150 | $329 |
| Release | 2014 | 2016 | 2016 | 2015 | 2018 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | n/a | ||||
| Oxygen | |||||
| Sleep | |||||
| Steps | n/a | ||||
| Swim | |||||
Battery | |||||
| Duration | 8 hours to 30 days | n/a | 20 hours | 5 days | Not Yet |
| Rechargeable | |||||
Compatibility | |||||
| Android | |||||
| iOS | |||||
| Windows Phone | n/a | n/a | NA | ||
| Mac | n/a | ||||
| Windows | n/a | ||||
Connectivity | |||||
| Bluetooth | |||||
| Cellular | |||||
| GPS | |||||
| NFC | |||||
| Wi-Fi | |||||
Display | |||||
| Color | |||||
| Resolution | n/a | n/a | n/a | NA | 384 x 480 |
| Size | n/a | n/a | 0.42 inches | NA | 1.78 inches |
| Touch | NA | ||||
| Type | n/a | n/a | OLED | OLED | MicroLED |
Functions | |||||
| Audio Speaker | Alerts only | Bluetooth | |||
| Clock | |||||
| Phone | n/a | ||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 3 ATM | 5 ATM | IP67 | 1 ATM | Not Yet |
Notifications | |||||
| Phone | n/a | ||||
| Emails | n/a | ||||
| Texts | n/a | ||||
Software | |||||
| Operating System | n/a | n/a | n/a | NA | Watch OS 5 |
| Apps | |||||
| Music | |||||