1. A device in a vehicle for monitoring the environment around the vehicle, comprising: an environment sensor system having a predetermined detection range; and an analyzer module for analyzing a signal of the environment sensor system, wherein the analyzer module selects and tracks at least one object in the predetermined detection range by determining an attention range as a function of at least one predetermined parameter, and wherein the attention range includes a threshold distance at which a restraint unit associated with the vehicle is triggered, wherein the threshold distance is selected to optimize, based on a duration required for deployment of the restraint unit, a triggering time.