The M2 sensor was discontinued in 2022. Existing M2 sensors are fully supported until at least 2029. For new installations, see the M3 sensor

M2 Charging

Charging the sensor

Charge the M2 via the Micro-USB port on the back of the sensor. Remove the sensor from its mounting plate to access the port; the power switch and charging indicator are also on the back.

Connection type	USB-C cable
Full charge time	Approximately 6 hours from empty
Maximum battery life	Up to 10 months between charges under optimal conditions; with power-hungry features such as crowd detect and Frequently Updated Motion disabled
Typical battery life	Around 5 months with standard features active, or if crowd detect or more frequent sensor updates are enabled
Power switch required	The sensor must be switched ON for charging to work.

Charging indicator lights

The charging indicator light is on the back of the sensor, next to the power switch and charging port. It is only visible after removing the sensor from its mounting plate.

Blinking green
Sensor is currently charging. If the battery is completely empty, it may take a few minutes before the blinking starts.
Solid green
Sensor is fully charged. Safe to unplug and reinstall on the mounting plate.
Blinking red
Charging error. Contact hello@minut.com with your sensor serial number and a description of the issue.
No light
Either no power is reaching the sensor (check cable and charger), or the power switch is set to OFF.

Temperature during charging. While the sensor is charging, the temperature reading in the app may not update. Once fully charged, all features will resume as normal.

Running the sensor hardwired

You can leave the M2 sensor permanently connected to a USB -C charger rather than relying on the battery. This works well for long-term installations where removing and charging the sensor between stays is inconvenient.

Indoor only	The M2 is for indoor use only. Hardwiring is safe indoors. Do not route the charging cable to expose the sensor to moisture or damp conditions.
Battery protection	When left plugged in for extended periods, the sensor automatically enters battery protection mode.
Charging cable routing	A USB- C cable can be routed along the wall or ceiling to a nearby socket.

M2 Battery

Battery protection mode

When the M2 sensor is left connected to the charger for an extended period, or is hardwired, it automatically switches to battery protection mode. The battery is held at a slightly lower charge level than full capacity to prevent long-term degradation from continuous charging.

What you notice	The charging indicator lights may appear not to show a full charge even though the cable is connected. The battery level in the app may show slightly below 100%.
Is it a problem?	No. This is expected behaviour. The sensor continues to work normally and monitoring is not affected.
To exit protection mode	Unplug the sensor for more than 24 hours. The protection mode will deactivate and the battery will charge to full on the next charge cycle.

Low battery notifications

When the battery is running low, Minut sends you a notification with approximately two weeks of battery life remaining; giving you time to arrange charging before the sensor goes offline.

Notification type	Push notification and email to the organisation owner and all team members with access to the rental unit
Time remaining	Approximately two weeks of battery life after the low battery notification is sent under typical usage conditions
Visual indicator	Pressing the main button (lens) on the front of the sensor shows a single red blink when the battery is critically low. See LED indicator lights — M2.

Extending battery life

If battery life is shorter than expected, disabling the following features will extend it significantly. Each can be toggled in your Noise Preset settings or device settings.

More Frequent Sensor Updates: disabled by default. When enabled, the sensor syncs data to the app more often, increasing radio activity and battery drain. Disable if battery life is a priority.
Crowd Detect: continuously monitors the number of devices near the sensor. Disabling it reduces battery consumption noticeably, especially in busy areas.
Instantly Turn On Alarm: when enabled, the security alarm activates without a countdown delay, requiring the sensor to update motion detection more frequently. Disabling it restores the default hourly motion update cycle and extends battery life. This does not affect how quickly the alarm triggers once motion is detected; that always happens instantly.
Notifications for Alarm Recognition: disabling glass break and noise-based alarm recognition reduces sensor processing load and improves battery life.

Improve Wi-Fi signal. A weak Wi-Fi signal causes the sensor antenna to use more power to maintain the connection. Moving the sensor closer to the router, or improving coverage with a Wi-Fi extender, can meaningfully extend battery life.

Replacing a low battery sensor

If you manage multiple properties, the most efficient way to handle a low battery sensor is Sensor Swap; it lets you replace a depleted sensor with a fully charged one without reinstalling. All settings, thresholds, and historical data transfer automatically to the replacement sensor.

See Sensor Swap.

Sensor not charging

If the charging indicator lights don’t appear when you plug in the sensor, try the following before contacting support:

Try a different USB-C cable: a faulty or low-quality cable is the most common cause
Try a different wall charger or USB port
Check the USB-C port on the sensor for debris or damage; use a dry, soft brush to gently clean it if needed
If the battery is completely flat, leave the sensor plugged in for 10–15 minutes before checking the indicator lights; a fully depleted battery takes a few minutes before it shows any charging signal

If none of the above resolves the issue, contact the Minut support team.

Email hello@minut.com with the following information: