What Do the LED Lights on the Collar Mean?

GPS Light

The GPS light, which is the teardrop-shaped indicator located under the Power button, may indicate any of the following and will help you understand the GPS status of the collar:

Halo 4

• High GPS signal strength → GPS Light behavior: Blinks Green*
• Low GPS signal strength → GPS Light behavior: Blinks Red*
• Needs GPS initialization → GPS Light behavior: Blinks Red
• Loading A-GPS data → GPS Light behavior: Stays On - Red

Note: While the Halo 4 & 5 do not have an LED indicating medium GPS signal strength, this information can be viewed within the Halo App.

*NOTE: While your dog/collar is not moving, the GPS Light will not blink

SAFETY NOTE: When GPS level is medium, the collar will NOT provide Prevention Feedback to your dog—even when outdoors. It will instead send a Return Whistle if it detects your dog crossing the Halo Fence. If this occurs in key areas of your yard, these levels can be adjusted via this process.

Halo 1, 2, 2+, 3

• High GPS signal strength → GPS Light behavior: Blinks Blue*
• Medium GPS signal strength → GPS Light behavior: Blinks Pink*
• Low GPS signal strength → GPS Light behavior: OFF*
• Needs GPS initialization → GPS Light behavior: Blinks Red
• Loading A-GPS data → GPS Light behavior: Stays On - Pink

*NOTE: While your dog/collar is not moving, the GPS Light will not blink

SAFETY NOTE: When GPS level is medium (blinking pink), the collar will NOT provide Prevention Feedback to your dog—even when outdoors. It will instead send a Return Whistle if it detects your dog crossing the Halo Fence. If this occurs in key areas of your yard, these levels can be adjusted via this process.

Battery / Charge Light (ALL Halo Generations)

The Battery/Charge Light provides:

• A low battery warning (yellow or red blinks) when the collar is unplugged
• A charging indicator (green blink while charging; solid green once fully charged) when the collar is plugged in

Additional Battery/Charge Light behavior:

• During collar boot-up → Solid green (usually 2–3 seconds)
• During collar power-down → Solid red (up to 5 seconds)

Please Note: Where the Battery light is located depends on the generation of the Halo Collar.

• Halo 4 & 5 → Battery light is located below the power button
• Halo 1, 2, 2+, 3 → Battery light is located above the power button

Firmware (ALL Halo Generations)

During a Collar Update ("firmware upgrade"):

• While applying new firmware → Battery/Charge Light will blink red and green sporadically
• Once complete → Light returns to blinking green or solid green depending on battery level

SAFETY NOTE: Do not unplug your collar from the charger when the Battery Light is blinking red. Wait for at least 15 seconds with the light blinking or solid green before unplugging it.

Checking the status at any time:
To see the Halo Logo color or GPS or battery status, press the collar’s power button for 1–2 seconds. The LEDs will blink in the appropriate colors described above.

Halo Logo Light (ONLY for Halo 1, 2, 2+, 3)

The Halo Logo light is the large, paw-shaped light on the front of your Halo Collar.

Bluetooth connection status:

• Connected to the Halo App via Bluetooth → Logo light blinks in your pet's selected color every 4 seconds
• Not connected via Bluetooth → Logo light remains OFF
• Issue with collar function → Logo blinks red and white

If you see a red and white blinking logo, please reference the Halo App or contact support.

Additional Notes

• The lights will behave differently during the indoor/outdoor configuration process. For more information, please see the article 'How to Optimize Your Halo Collars GPS Signal Levels'
• If you have any further questions and would like to speak to our live support team, please feel free to reach out using the following article: How to Contact Customer Support, and we'll be happy to help!