Zensorium is finally launching an Android app for its health tracking device – Tinke.

Originally launched in 2012, Tinke was only available for iPhone users. The small device comes with optical sensing technology that quantifies fitness and relaxation levels.

It also comes with a special sensor (activated when the user places a fingertip on it) that can show users heart rate, respiratory rate, blood oxygen levels, and heart rate variability. The first three parameters are used to measure cardio-respiratory fitness, while heart rate variability is said to be an assessment of the autonomic nervous system for detecting stress.

Tinke allows users to track those settings and compare them over time to determine their fitness level. The device itself is available for $129.