NAXA NSW-11 Lifeforce+ Fitness Watch, Black/Blue, OLED Screen with Time Display, Step Counter and Calorie Tracking Helps you Improve your Health with Easy to Reach Goal and Activity Monitoring Get energized! Sleep monitoring helps you improve your sleep quality Includes two colorful, durable and adjustable wristbands Bluetooth 4.0 low-energy wireless sync Downloadable companion app for your iPhone or Android smartphone Dimensions (LxWxH): 0.75" x 0.50" x 10.13"