When Tags are powered on they will trigger an alarm when they get within a 2 meter range of each other1.

Power on

To power a Tag on, press the button for a minimum of 2 seconds. The LED will light up green for 1 second and will then continue blinking green at a rate of 1Hz (= 1 LED blink per second) to indicate that the device is on.

In this mode the UWB becomes active:

  • The social distancing / alarm feature will be enabled.
  • The Tag will sent out diagnostic packets with its FW version, HW version and battery level. The battery level can be consulted from the Pozyx RTLS web application and from the Infection Insights web application. The FW version and HW version can only be consulted in the Pozyx RTLS web application.
  • The Tag can be positioned when used in a full RTLS system.

Power off

To power a Tag off, press the button again for a minimum of 2 seconds. The LED will light up red for 1 second and will stop blinking.

In this mode the UWB becomes inactive:

  • The social distancing / alarm feature will be disabled.
  • The Tag will no longer sent out the diagnostic packets with its FW version, HW version and battery level.
  • The tag can no longer be positioned in an RTLS system.

The Tag won't shut down completely though: The BLE2 will remain active and the Anchor will still be able to connect with the Tag to offload the contact tracing data from it3.

Low battery mode

When the battery drops to 5% the LED will start blinking red instead of green (at the same rate of 1Hz) and the Tag will power off. This means that the UWB will no longer be active (see above for the implications of this) but the BLE will remain active so that data offloading to the Anchor can still take place. When the Tag is in low battery mode and an Anchor connects with it via BLE, the Tag's LED will keep blinking red at 1Hz instead of switching to a blue blink at 2Hz like it would in normal conditions (= when the battery is above 5%).

When you charge the Tag the charging LED will light up orange. When the battery is at 100% the charging LED will change from orange to green.

The Tag will NOT power on automatically when the battery gets to > 5% as this would cause a lot of alarms going off when working with a charging station where several Tags are charged next to each other.

BLE connected

When the Tag is connected with an Anchor via BLE the LED will blink blue at a rate of 2Hz. This is the case when:

  • The tag is powered off
  • The tag is powered on

However: When the Tag makes a connection with the Anchor while it is in low battery mode or when the alarm is going off, the LED will not turn blue. In low battery mode it will keep blinking red at 1Hz, and when the alarm is going off it will stay solid red. 

Contact tracing

The encounters between Tags are stored in their memory so they can later be used in the Infection Insights web application for contact tracing. The memory of the Tag can store data for 14 days4 and up to 100 encounters within a 15 minute time window5.


1 This distance is configurable as explained here: Configure the Tag alarm distance

2 Bluetooth Low Energy

3 See Infection insights for more information about this

4 After 14 days the tag will start to overwrite the data: The data is bundled in blocks of 15 minutes and will be overwritten per block (at 00:15 on day 15 the data block of 00:15 of day 1 will be overwritten, at 00:30 on day 15 the data block of 00:30 of day 1 will be overwritten, etc...).

5 The tag can store 100 encounters in each block of 15 minutes. An encounter means coming within 5 meter range of the other tag (this distance is not configurable and is unrelated to the alarm distance that you can configure in the Infection Insights application). The 101st encounter within that 15 minute block will be disregarded.