Described as "the world's first non-skin contact wearable device which aims to improve overall human body performance and help people with anxiety, insomnia, and chronic disease related to problems in the vagus nerve," the Amofit S is the improved version of the AMO+, which was released in 2019, and starts at US$199.
https://www.notebookcheck.net/Non-skin-contact-wearable-device-amofit-S-to-begin-shipping-next-month.622846.0.html