U.S. Coast Guard Petty Officer 1st Class Anthony Smith conducts sound-powered phone training to the crew aboard USCGC Kimball (WMSL 756). Sound-powered phones use the speaker's voice to generate energy to transmit the audio signal, making it a reliable source of communication in emergency situations on ships. Kimball provides search-and-rescue coverage and conducts living marine resources and counter Illegal Unreported and Unregulated Fishing operations during its patrol of the Bering Sea.