1## Biometric HALs ## 2--- 3 4## Overview: ## 5 6The interfaces within the biometrics.* HAL tree are used by the Android Biometric Services 7(e.g. FingerprintService, FaceService) to discover and operate biometric sensors on the device. 8 9More details and versioning information can be found within each particular HAL. 10 11More complete information about the Android Biometric HALs and subsystem can be found at 12[source.android.com](https://source.android.com/security/biometric).