Here is a smart wearable device that can train your brain to be calmer and more focused. Sens.ai comes with EEG neurofeedback, HRV training, and infrared light therapy. Its electrodes require zero gel. This wearable device can train a full spectrum of brainwaves, including theta and gamma.
The device has a pulse oximeter sensor that can read your heart signals with precision. It comes with 20 programs for you to choose from to relax, deepen meditation, sleep better, and improve your mood. Sens.ai is compatible with iOS and Android devices. It lasts over 8 hours on battery.[where to get it]