Can CCTV hear your voice depends on the specific camera system, as not all CCTV cameras have audio recording capability. Many modern IP cameras and some analog cameras come with built-in microphone or audio input for external microphone, and these can record audio along with video if enabled. However, many traditional CCTV cameras are video only and cannot hear voice. Whether audio is recorded depends on three factors, does camera hardware have microphone, is audio recording enabled in DVR or NVR settings, and is audio recording legally allowed in your jurisdiction, as many states and countries require consent for audio recording and prohibit audio in workplaces without notice. High resolution cameras often advertise audio as feature. If you are asking about your own CCTV, check specifications for built-in mic, look for audio settings in recorder, and test playback. If you are asking about being recorded, assume that many modern systems in stores, offices, and homes may have audio capability, but video only systems cannot hear. In workplaces, employers often disable audio to comply with wiretapping laws, so video may exist without audio. Always check local laws before enabling audio recording.
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