Arduino is a wonderful platform for learning electronics and building smart gadgets. With CulBox, you can experiment with your own smartwatch. This is an open source wristwatch with built-in Bluetooth and sensors. It has a 32 bit Arm Cortex processor, 6-axis motion sensor, air pressure sensor, a 1.5″ OLED display, 3 push buttons, and everything you need in a watch.
CulBox comes with a raw app you can use as a template for your own projects. It accepts microSD cards. There is also a multipurpose port for charging the battery and connecting the device to Arduino for programming.