Here is a smart wearable device that helps take your meditation to the next level. The Dhyana Meditation Ring comes with HRV sensors and gives you biofeedback when you lose focus or need to breathe. It combines with an app to bring you plenty of meditations to improve your focus, deepen your sleep, and reduce your stress.
The device also has a 3-axis accelerometer and Bluetooth connectivity. It lasts up to 7 days on battery. You can find out more about it here.