5. Razer Nabu($49)
This wearable tracker claims to understand you by being with you. It combines health monitoring with social and phone notifications. The public screen on your wrist alerts you when a message comes in, and the private screen on the bottom shows the message. To dismiss a call notification, simply shake your wrist. Also, two Nabu users can exchange data with a handshake, and the device offers fitness and sleep tracking as well. Nabu is now available to app developers.