How do you unlock heartbeat sensor?

To unlock the heartbeat sensor in a game like "Call of Duty," you typically need to complete specific challenges or objectives related to the sensor itself, such as using it in a certain number of matches or achieving a set number of kills while using it. Check the game's in-game menu or challenges section for detailed requirements. Additionally, some games might require reaching a certain level or unlocking it as part of a battle pass. Always refer to the latest game updates for any changes in unlock requirements.