Polar M400 vs. Sony SmartWatch 3 vs. Fitbit Charge 2 vs. Fitbit Flex vs. Xiaomi Mi Band 3
 | | | | | |
| PolarM400Remove Buy Now | SonySmartWatch 3Remove Buy Now | FitbitCharge 2Remove Buy Now | FitbitFlexRemove Buy Now | XiaomiMi Band 3Remove Buy Now |
Basic Info | |||||
| Suggested Price | $200 | $250 | $150 | $100 | $44.95 |
| Release | 2014 | 2014 | 2016 | 2013 | 2018 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | n/a | ||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 8 hours to 30 days | 2 days | 5 days | 5 days | 20 days |
| 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 | 320 x 320 | n/a | NA | 128 x 80 |
| Size | n/a | 1.6 inches | n/a | NA | 0.78 inches |
| Touch | n/a | NA | |||
| Type | n/a | TFT LCD | OLED | LED | OLED |
Functions | |||||
| Audio Speaker | Alerts only | Bluetooth | |||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 3 ATM | IP68 | n/a | 1 ATM | 5 ATM |
Notifications | |||||
| Phone | |||||
| Emails | |||||
| Texts | |||||
Software | |||||
| Operating System | n/a | Android Wear | n/a | NA | |
| Apps | |||||
| Music | |||||