They just announced the new smallest sensor head. $5 soon.
https://www.businesswire.com/news/home/20250402019875/en/The-Worlds-Smallest-PPG-Sensor-Head
They just announced the new smallest sensor head. $5 soon.
https://www.businesswire.com/news/home/20250402019875/en/The-Worlds-Smallest-PPG-Sensor-Head