Currently, the e-tattoo only works on hairless skin but there is work to try and make the device more accessible, combining it with ink that can work on hair and working to make the product useable at home.

The novel, low-profile system accurately measured mental workload and predicted mental strain in a small study.

Researchers gave participants face tattoos that can track when their brain is working too hard. Published in the journal Device, the study introduces a non-permanent wireless forehead e-tattoo that decodes brainwaves to measure mental strain without bulky headgear.