Polar M400 vs. Fitbit Alta vs. Amazfit Stratos vs. Garmin 645 Music
 | | | | |
| PolarM400Remove Buy Now | FitbitAltaRemove Buy Now | AmazfitStratosRemove Buy Now | Garmin645 MusicRemove Buy Now |
Basic Info | ||||
| Suggested Price | $200 | $130 | $199 | $450 |
| Release | 2014 | 2016 | 2018 | 2018 |
Activity & Fitness | ||||
| Calories | ||||
| Cycling (Bicycling) | ||||
| Distance | ||||
| Heart | n/a | |||
| Oxygen | ||||
| Sleep | ||||
| Steps | ||||
| Swim | ||||
Battery | ||||
| Duration | 8 hours to 30 days | 5 days | 5 days | 7 days |
| Rechargeable | ||||
Compatibility | ||||
| Android | ||||
| iOS | ||||
| Windows Phone | n/a | |||
| Mac | ||||
| Windows | ||||
Connectivity | ||||
| Bluetooth | ||||
| Cellular | ||||
| GPS | ||||
| NFC | ||||
| Wi-Fi | ||||
Display | ||||
| Color | ||||
| Resolution | n/a | n/a | 320 x 300 | 240 x 240 |
| Size | n/a | n/a | 1.34 inches | 1.2 inches |
| Touch | n/a | |||
| Type | n/a | OLED | OLED | MIP |
Functions | ||||
| Audio Speaker | Alerts only | |||
| Clock | ||||
| Phone | ||||
| Vibration | ||||
| Voice | ||||
Hardware | ||||
| Accelerometer | ||||
| Barometer or Altimeter | ||||
| Ultraviolet Sensor | ||||
| Water Resistance | 3 ATM | n/a | 5 ATM | 5 ATM |
Notifications | ||||
| Phone | ||||
| Emails | n/a | |||
| Texts | ||||
Software | ||||
| Operating System | n/a | n/a | Proprietary | |
| Apps | ||||
| Music | ||||