> For the complete documentation index, see [llms.txt](https://avss.gitbook.io/prs-m4ex-for-dji-m4e-and-m4t-easa-c5/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://avss.gitbook.io/prs-m4ex-for-dji-m4e-and-m4t-easa-c5/prs-m4ex-for-dji-m4e-and-m4t/frequently-asked-questions.md).

# Frequently Asked Questions

<table data-header-hidden><thead><tr><th width="88"></th><th width="243"></th><th></th></tr></thead><tbody><tr><td>1</td><td>How do I register my PRS-M4EX?</td><td>Go to <a href="https://www.avss.co/drone-parachutes/drone-parachute-product-registration/">https://www.avss.co/products/product-registration/</a>.</td></tr><tr><td>2</td><td>When does the ATS Arm?</td><td>40 metres.</td></tr><tr><td>3</td><td>When does the PRS-M4EX return to a standby state?</td><td>The ATS is temporarily disabled when the Drone is within five (5) meters of the ground or any obstacle below the drone. If this sensor is not available then the ATS will disarm after landing for five (5) seconds. <br><br>NOTE: ENSURE THAT THE PSDK WINDOW DISPLAYS THE "DISARMED" MESSAGE BEFORE APPROACHING THE DRONE.</td></tr></tbody></table>