Basic Info |
| Wear Type | Wristband | Wristband | |
| Price | | | |
| Ratings | | | |
Activity & Fitness |
| Activity | No | Yes | U9 tracks your activity |
| Calories | Yes | Yes | Both track calories burned |
| Sleep | No | Yes | U9 monitors your sleep pattern |
| Heart Rate / Pulse | Yes | No | Polar RS400sd tracks heart rate |
| External HR Monitor | Yes | No | |
| Distance | Yes | Yes | Both track your stride length |
| Steps | Yes | Yes | Both track how many steps you take |
| Pace | Yes | No | |
| Speed | Yes | No | |
| Stairs / Floors | No | No | Both don't track climbing stairs or floors |
| Exercise Tagging | No | No | Both don't have exercise tagging |
| Smart Coach | Yes | No | Polar RS400sd provides real time fitness coaching |
| Goal Setting | Yes | Yes | Both can help with your goals setting |
| Inactivity Alert | No | Yes | U9 helps you stay active with inactivity alert |
Additional Features |
| GPS | No | No | Both don't have built-in GPS support |
| 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 | Yes | Both have reminder app |
| Stopwatch | Yes | Yes | Both have stopwatch |
| Music Playback | No | No | Both don't have music playback |
| Temperature | No | Yes | |
| Reports | | Activity, Sleep | |
Smartphone Remote Features |
| Notifications | No | Yes | If you get a phone notification, U9 make an alert for you |
| Caller ID | No | Yes | U9 can notify you who is calling |
| Music Control | No | Yes | U9 allows control smartphone music player |
| Call Control | No | No | Both don't have call control |
| Camera Control | No | Yes | U9 has a smartphone's remote control function |
| Find Phone | No | Yes | U9 allows you to locate your phone |
Battery |
| Duration | n/a | n/a | |
| Battery Type | Rechargeable Battery | Rechargeable Battery | |
Physical Specs |
| Weather Resistance | Yes | Yes | |
| Waterproof | No | No | |
| IP Rating | 5 ATM | n/a | |
| Weight | 45 grams | 63 grams | Polar RS400sd is 18.0 g lighter |
User Interface |
| Display | LCD Screen | LCD Screen | |
| Display Size | n/a | 1.44 inches | |
| Screen Resolution |
n/a
|
128 x 128 pixels
| |
| Color Display | No | Yes | |
| Touch Screen | No | Yes | |
Compatibility |
| Android | No | Yes | U9 is compatibles with Android phones and tablets |
| iOS | No | Yes | U9 can connect with iPhones or iPads |
| OS X/Mac | Yes | No | Polar RS400sd compatibles with MacBooks and iMacs |
| Windows Phone | No | No | Both don't compatible with Windows Phone devices |
| Windows | Yes | No | Polar RS400sd allows you to locate your phone |
| Web Portal | Yes | No | Polar RS400sd allows you upload and view data on the online portal |
| Social Features | No | No | Both don't have social features |
Connectivity |
| Bluetooth | No | Yes | Only U9 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 GearBest | |
