Polar M400 vs. Acer Liquid Leap vs. Diesel On Full Guard vs. Fitbit Flex vs. Apple Watch Series 4
 | | | | | |
| PolarM400Remove Buy Now | AcerLiquid LeapRemove Buy Now | DieselOn Full GuardRemove Buy Now | FitbitFlexRemove Buy Now | AppleWatch Series 4Remove Buy Now |
Basic Info | |||||
| Suggested Price | $200 | $90 | $325 | $100 | $329 |
| Release | 2014 | 2015 | 2017 | 2013 | 2018 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | n/a | ||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 8 hours to 30 days | 5 to 7 days | 1 day | 5 days | Not Yet |
| Rechargeable | |||||
Compatibility | |||||
| Android | |||||
| iOS | |||||
| Windows Phone | n/a | NA | |||
| Mac | |||||
| Windows | |||||
Connectivity | |||||
| Bluetooth | |||||
| Cellular | |||||
| GPS | |||||
| NFC | |||||
| Wi-Fi | |||||
Display | |||||
| Color | |||||
| Resolution | n/a | 128 x 32 | 454 x 454 | NA | 384 x 480 |
| Size | n/a | 1 inch | 1.4 inches | NA | 1.78 inches |
| Touch | NA | ||||
| Type | n/a | OLED | OMOLED | LED | MicroLED |
Functions | |||||
| Audio Speaker | Alerts only | ||||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 3 ATM | IPX4 | IP67 | 1 ATM | Not Yet |
Notifications | |||||
| Phone | |||||
| Emails | |||||
| Texts | |||||
Software | |||||
| Operating System | n/a | Android Wear 2.0 | NA | Watch OS 5 | |
| Apps | |||||
| Music | |||||