Do Security Cameras Have Audio, and is it Legal?

While it's safe to assume that most home security cameras also record audio, it's not always the case. Let's explore which types of security cameras use audio and what they use it for.

Most modern Wi-Fi cameras (also called IP cameras) come with built-in microphones, which they use for three purposes:

• Capture audio while recording video footage of a motion detection event. Recording audio can reveal useful information not captured on video, like arguments with a person out of frame or the sound of a vehicle driving away.
• Some cameras use audio to trigger video recording so you don't miss important details that happen before motion detection kicks in.
• Two-way audio uses a camera's built-in speaker like an intercom so you can talk with people near the IP camera using your mobile device. This is helpful for talking to family members without phones or issuing warnings to intruders.

A traditional surveillance camera system with video cables and a DVR typically doesn't have a microphone. You'll need to buy specific audio surveillance cameras and DVRs to record audio with these systems.

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You can find microphones on security cameras near the lens. It usually looks like a pinhole, similar to what you can find on many kinds of headphones and smartphones.

Security camera privacy laws in two-party consent states¹ (all-party consent) make it illegal to record audio without the express permission of everyone being recorded. Here are the 12 states requiring two-party consent²: 

All other US states are one-party consent states, which allow recording as long as one person in the recording gives consent. To be on the safe side, it's probably not a good idea to record audio if you're not present, either in-person or remotely using two-way audio.

Most states have privacy laws forbidding recording of any kind in places with a reasonable expectation of privacy like bathrooms, bedrooms, and private spaces owned by others.

It never hurts to double-check your state's security camera laws if you're unsure about where to set up a camera legally—whether it's a hidden camera or located in plain sight. This article is for information purposes only and isn't a substitute for advice from a legal professional.

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1. Digital Media Law Project, "Recording Phone Calls and Conversations," January 2021. Accessed August 11, 2021.
2. Recording Law, "All Party (Two Party) Consent States," September 2017. Accessed August 11, 2021.
3. Teo Spengler, Legal Beagle, "If I Put Up Surveillance Cameras, Do I Need to Post a Sign?," December 2018. Accessed August 11, 2021.