Basic Info |
| Wear Type | Wristband | Wristband | |
| Price | $18000 | $18998 | Polar M400 is 110% cheaper |
| Ratings | | | |
Activity & Fitness |
| Activity | Yes | Yes | Both track daily activity |
| Calories | Yes | Yes | Both show estimated calories burned |
| Sleep | Yes | No | Polar M400 monitors your sleep pattern |
| Heart Rate / Pulse | No | Yes | Polar RS300X has the heart rate monitoring sensor |
| External HR Monitor | Yes | No | |
| VO2 Max | Yes | No | Polar M400 shows the maximum volume of oxygen you can consume per minute |
| Distance | Yes | Yes | Both track your stride length |
| Steps | Yes | Yes | Both track and count your steps |
| Pace | Yes | No | |
| Stairs / Floors | Yes | No | Polar M400 has built-in altimeter for elevation feature |
| Exercise Tagging | No | Yes | Only Polar RS300X provides exercise tagging |
| Smart Coach | Yes | Yes | Both can help with smart coaching |
| Goal Setting | Yes | Yes | Both can help with your goals setting |
| Inactivity Alert | Yes | No | Polar M400 helps you stay active with inactivity alert |
Additional Features |
| GPS | Yes | Yes | Both have integrated GPS modules |
| Compass | No | No | Both don't have a compass |
| Watch / Clock | Yes | Yes | Both have watch |
| Alarm Clock | Yes | Yes | Both have alarm clock |
| Reminders | Yes | No | Polar M400 has a reminder option |
| Stopwatch | No | No | Both don't have stopwatch |
| Music Playback | No | No | Both don't have music playback |
| Reports | Activity, Sleep | Activity | |
Smartphone Remote Features |
| Notifications | Yes | No | If you get a phone notification, Polar M400 make an alert for you |
| Caller ID | Yes | No | Polar M400 can notify you who is calling |
| Music Control | No | No | Both don't have phone music control |
| Call Control | Yes | No | Polar M400 allows you control phone calls |
| Camera Control | No | No | Both don't have camera control |
| Find Phone | No | No | Both don't have a find phone feature |
Battery |
| Duration | 24 days | 365 days | Polar RS300X battery life is about 15.2 times longer |
| Battery Type | Rechargeable Battery | Replaceable Cell Battery | |
Physical Specs |
| Weather Resistance | Yes | Yes | |
| Waterproof | No | Yes | |
| IP Rating | 3 ATM | n/a | |
| Weight | 57 grams | 181 grams | Polar M400 is 124.0 g lighter |
User Interface |
| Display | Yes | Yes | |
| Display Size | n/a | n/a | |
| Screen Resolution |
128 x 128 pixels
|
n/a
| |
| Color Display | No | No | |
| Touch Screen | No | No | |
Compatibility |
| Android | Yes | No | Polar M400 is compatibles with Android phones and tablets |
| iOS | Yes | No | Polar M400 can connect with iPhones or iPads |
| OS X/Mac | Yes | Yes | Both compatible MAC OS X laptops and PCs |
| Windows Phone | Yes | No | Polar M400 compatibles with a range of Windows Phone devices |
| Windows | Yes | Yes | Both can help find your smartphone |
| Web Portal | Yes | Yes | Both have access to online web portal |
| Social Features | Yes | No | You can integrate Polar M400 with social networks and share information |
Connectivity |
| Bluetooth | Yes | No | Only Polar M400 has a built-in Bluetooth connection option |
| Wi-Fi | No | No | Both don't have Wi-Fi connection |
| NFC | No | No | Both don't have NFC connectivity |
| ANT+ | No | No | Both don't provide ANT+ wireless technology |
| Buy on Amazon | Buy on Amazon | |
