Polar M400 vs. Fitbit Charge 2 vs. Polar A360 vs. Michael Kors Grayson vs. Jaybird Reign vs. Michael Kors Grayson
 | | | | | | |
| PolarM400Remove Buy Now | FitbitCharge 2Remove Buy Now | PolarA360Remove Buy Now | Michael KorsGraysonRemove Buy Now | JaybirdReignRemove Buy Now | Michael KorsGraysonRemove Buy Now |
Basic Info | ||||||
| Suggested Price | $200 | $150 | $200 | $350 | $150 | $350 |
| Release | 2014 | 2016 | 2015 | 2018 | 2015 | 2018 |
Activity & Fitness | ||||||
| Calories | ||||||
| Cycling (Bicycling) | ||||||
| Distance | ||||||
| Heart | n/a | |||||
| Oxygen | ||||||
| Sleep | ||||||
| Steps | ||||||
| Swim | ||||||
Battery | ||||||
| Duration | 8 hours to 30 days | 5 days | 12 days | 24 hours | 5 days | 24 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 | ||||||
| Resolution | n/a | n/a | 160 x 80 | 453 x 454 | NA | 453x454 |
| Size | n/a | n/a | 1.18 inches | 1.39 inches | NA | 1.39 inches |
| Touch | n/a | NA | ||||
| Type | n/a | OLED | n/a | AMOLED | LED | AMOLED |
Functions | ||||||
| Audio Speaker | Alerts only | |||||
| Clock | ||||||
| Phone | ||||||
| Vibration | ||||||
| Voice | ||||||
Hardware | ||||||
| Accelerometer | ||||||
| Barometer or Altimeter | ||||||
| Ultraviolet Sensor | ||||||
| Water Resistance | 3 ATM | n/a | WR30 | 1 ATM | NA | 1 ATM |
Notifications | ||||||
| Phone | ||||||
| Emails | ||||||
| Texts | ||||||
Software | ||||||
| Operating System | n/a | n/a | n/a | Android Wear | NA | Android Wear |
| Apps | ||||||
| Music | ||||||