pinger ( synonym found)
Definition of pinger:

°A device that emits a short, high-pitched sound bust (i.e. goes, "ping!") such as in sonar or other echo location systems.
"We couldn't take the boat into the shallows near the reef because our sonar pinger was broken."
°A device that periodically emits a signal that can be monitored to permit movement tracking.
"The scientist attached a pinger to the carapace of the sea turtle to track its migration."
Definition of pinger:

°A device that emits a short, high-pitched sound bust (i.e. goes, "ping!") such as in sonar or other echo location systems.
"We couldn't take the boat into the shallows near the reef because our sonar pinger was broken."
°A device that periodically emits a signal that can be monitored to permit movement tracking.
"The scientist attached a pinger to the carapace of the sea turtle to track its migration."
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