Polar M400 vs. Amazfit T-Rex vs. HTC re Grip
 | | | |
| PolarM400Remove Buy Now | AmazfitT-RexRemove Buy Now | HTCre GripRemove Buy Now |
Basic Info | |||
| Suggested Price | $200 | $140 | $199 |
| Release | 2014 | 2019 | 2020 |
Activity & Fitness | |||
| Calories | |||
| Cycling (Bicycling) | |||
| Distance | |||
| Heart | n/a | ||
| Oxygen | |||
| Sleep | |||
| Steps | |||
| Swim | |||
Battery | |||
| Duration | 8 hours to 30 days | 20 days | 5 hours to 2.5 days |
| Rechargeable | |||
Compatibility | |||
| Android | |||
| iOS | |||
| Windows Phone | n/a | NA | |
| Mac | NA | ||
| Windows | NA | ||
Connectivity | |||
| Bluetooth | |||
| Cellular | |||
| GPS | |||
| NFC | |||
| Wi-Fi | |||
Display | |||
| Color | |||
| Resolution | n/a | 360 x 360 | 160 x 32 |
| Size | n/a | 1.3 inches | 1.8 inches |
| Touch | |||
| Type | n/a | AMOLED | PMOLED |
Functions | |||
| Audio Speaker | Alerts only | ||
| Clock | |||
| Phone | |||
| Vibration | |||
| Voice | |||
Hardware | |||
| Accelerometer | |||
| Barometer or Altimeter | |||
| Ultraviolet Sensor | |||
| Water Resistance | 3 ATM | 5 ATM | IP57 |
Notifications | |||
| Phone | |||
| Emails | |||
| Texts | |||
Software | |||
| Operating System | n/a | Build-in | NA |
| Apps | |||
| Music | |||