M400 Band 2 Ray Mi Band
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Basic Info

Suggested Price $200 $250 $100 $15
Release 2014 2015 2016 2015

Activity & Fitness

Calories
Cycling (Bicycling)
Distance
Heart n/a
Oxygen
Sleep
Steps
Swim

Battery

Duration 8 hours to 30 days 48 hours (without GPS) 6 months 30 days
Rechargeable

Compatibility

Android
iOS
Windows Phone n/a n/a
Mac n/a n/a NA
Windows n/a n/a NA

Connectivity

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Color n/a NA
Resolution n/a 320 x 128 n/a NA
Size n/a 1.36 inches n/a NA
Touch n/a NA
Type n/a Capacitative TFT LED NA

Functions

Audio Speaker Alerts only
Clock
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance 3 ATM IPX7 5 ATM IP67

Notifications

Phone
Emails
Texts

Software

Operating System n/a n/a n/a NA
Apps
Music

All Wearables