Tesla Sentry Mode explained: how it works, how much battery it uses, and the privacy rules in Europe

Sentry Mode is one of the best-known Tesla features. It keeps an eye on your parked car using the car's own cameras, and it can scare off thieves or record what happened if someone dents your door. But it also uses energy, needs the right storage and, in Europe, comes with privacy rules. Here is a practical guide.

How Sentry Mode works

When Sentry Mode is on, the cameras and the car's computer stay awake while the car is locked and in Park. If the car detects a possible threat, such as someone leaning on it or trying a door, it reacts: the headlights pulse, a message appears on the touchscreen and, in more serious cases, the alarm can sound. You also get a notification in the Tesla app.

You can switch it on in several ways:

• Tap Controls and then the Sentry icon, which turns red when active.
• Use the Tesla app.
• Use a voice command such as 'Sentry on'.
• Set it to switch on automatically whenever you park.

Under Controls, Safety, Sentry Mode, you can exclude places such as home, work or favourite destinations. That saves energy and avoids recording places you know well.

Storage: you need a USB drive

Sentry Mode saves its clips to a USB drive, not to the cloud. Use a USB 2.0-compatible drive with at least 64 GB. In many recent models, the port in the glove box is the one to use, because some centre console ports only provide power. You can format the drive in the car, under Controls, Safety.

When the drive is full, new recordings overwrite the oldest ones. In the car's Dashcam viewer, Sentry events are marked with a red dot. Recordings do not include sound.

How much battery does it use?

This is the main downside. Keeping the cameras and computer running takes roughly 250 to 300 watts. That works out to about one mile (1.6 km) of range per hour, or up to about 7.2 kWh per day. Depending on the model and battery, that is roughly 7% to 14% of the battery every 24 hours.

• Sentry Mode switches itself off when the battery drops to 20%, and you get a notification in the app.
• It is not a good idea for long-term parking, for example at an airport for a week.
• Excluding home and work is the easiest way to cut the drain in daily use.

Watching live from your phone

With Premium Connectivity, you can view your car's cameras live in the Tesla app. You have to enable it in the Sentry Mode settings first, and it only works when nobody is in the car and all doors are locked. While someone is watching, the car flashes its exterior lights and shows a message on the screen, so people nearby know. The stream is encrypted, and use is limited to about an hour a day, or 15 minutes in some regions. Cars with an external pedestrian speaker also let you talk through it. The live view is not available in every market.

Privacy: why Europe is different

A car that films the street raises privacy questions, and European regulators have taken them seriously. In 2023 the Dutch data protection authority (AP) investigated Sentry Mode. It found that the original version filmed everything around the car continuously and kept the footage for an hour. One board member called it 'a serious violation of privacy'.

Tesla changed the feature after the investigation. The cameras are off by default, recording is limited to a maximum of 10 minutes when the owner switches them on, the headlights can pulse to warn people that they are being filmed, and the footage stays in the car rather than going to Tesla. The regulator did not fine Tesla, but made clear that the owner is legally responsible for what the cameras record.

In practice, that means: use Sentry Mode to protect your car, not to film your neighbours, and be careful about sharing clips that show other people's faces or number plates.

Quick tips

• Use a good quality drive of 64 GB or more, and format it in the car.
• Exclude home and work to save several percent of battery per day.
• Turn Sentry Mode off when parking for long periods.
• Check the rules in your country before sharing footage online.