How voice assistants work, in plain terms
A smart speaker or voice assistant waits for a wake word, such as a name or short phrase. When it believes it has heard that word, it starts processing what you say next. Depending on the product, the audio may be handled partly on the device and partly sent to the company’s servers, where it is turned into text and an answer is produced.
Two things follow from this. First, the device must be listening locally for the wake word, even if it is not meant to keep or send anything before then. Second, it can sometimes activate by mistake when it mishears a similar sound or a word on the television. Those accidental activations can lead to short clips being saved that you never meant to share.
Details vary by manufacturer and change over time, so the company’s privacy page and the app’s settings are the authoritative source for your device.
What may be stored
Depending on the service and your settings, an account may hold:
- Transcripts of requests, and sometimes the audio of them
- A history of questions, commands, music played and devices controlled
- Information about which household member’s voice was recognized, if voice profiles are turned on
- Related data such as the device name, time and approximate location
Companies often say they use this data to provide the service and improve it, and some offer settings to limit that use. Whether human reviewers can ever listen to samples, and whether your recordings are used to improve products, is typically described in the policy or in a settings option. If the wording is unclear, assume more is kept rather than less.
Review what has been saved
Most services let you see your history in the companion app or in a privacy section of your account on the manufacturer’s website. Look for terms such as voice history, activity, recordings, privacy or data and personalization.
Reviewing is worth doing once, because it shows what the device actually captures. Some people find entries they do not remember, such as short clips from accidental activations. Seeing that can help you decide how much to keep.
Delete recordings and set automatic limits
Typical options include:
- Delete individual items. Remove a specific request or recording from the list.
- Delete everything. Clear the whole history, often by date range.
- Auto-delete. Choose to remove history automatically after a set period, such as a few months, or not to save it at all.
- Do not save recordings. Some services allow you to stop storing audio while still keeping text, or to stop storing history entirely.
Note that deleting history may reduce personalization, and some features that rely on your past requests may work less well. It is a trade-off between convenience and privacy, and you can change your mind later.
Also check whether deletion covers connected services. Data from linked music, shopping or smart home skills and apps may be held by those third parties under their own policies. Review which services are linked, and remove any you do not use; the same principle applies as with connected app access on social accounts.
Adjust listening settings
Besides history, the listening behavior itself can often be changed.
- Use the mute switch. Most smart speakers have a physical button that disconnects the microphone, usually shown by a light. It is a helpful signal when you want a private conversation, because a physical switch is easier to trust than a software setting.
- Change the wake word. If the speaker keeps activating by accident, a different wake word may help.
- Turn on activation sounds or lights. A chime or light when the device starts listening lets you notice accidental triggers.
- Review voice recognition. If voice profiles are enabled, decide whether you need them. They allow personalized replies but involve storing voice-based information.
- Disable purchasing by voice, or require a PIN, so a child, guest or television cannot place orders.
- Limit access to personal results. Some assistants will read out calendar entries, messages or contacts to anyone in the room. Restricting this to a recognized voice or a locked phone helps.
- Check optional programs. Settings sometimes include opt-ins for data use, such as sharing recordings with the company to improve its services. Read them and choose deliberately.
Secure the account behind the speaker
Your voice history lives in an account, so the account’s safety matters as much as the speaker’s. Use a unique, strong password, enable two-step sign-in, and review which devices and apps are linked. The guidance on password security explains why these basics make such a difference. Keep the speaker’s firmware current, and keep it on a network with good home Wi-Fi security. If the speaker belongs to a household where one person manages the account, make sure that person knows how to review and delete history.
Before you sell, give away or discard it
Voice assistants often hold account links, saved Wi-Fi details and linked-service tokens. Before the speaker leaves your hands, remove it from the account, delete your history, and perform a factory reset. The article on smart device resets explains the order of steps.
What to do if something seems wrong
If your speaker responds when nobody has spoken, plays unfamiliar content, or the history shows requests you did not make, there are usually ordinary explanations: a television, a mishearing, or a household member. Check the history and the device’s linked users first. If you cannot explain it, change the account password, remove unknown devices or users, and consider a factory reset. If you believe someone is monitoring or harassing you, contact your local police.