Implementations of the subject technology provide power efficient object detection for electronic devices. Power efficient object detection can be provided in order to allow extended tracking of objects by portable devices such as battery powered devices. In one or more implementations, a recommendation engine including a machine learning model and/or a rule-based recommendation process may be provided that has been trained to output a sensor recommendation indicating at least one sensor for object tracking. The sensor recommendation can indicate which of several sensors to operate to track a particular object and/or an accuracy level for operating the recommended sensor.