How to test if key FOB is working?

I try to figure out if this key FOB is working, the battery is dead or it's not sending a signal
(EP 398.556)
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⚠️-Disclaimer: Due to factors beyond the control of unclemark, I cannot guarantee against improper use or unauthorized modifications of this information. Unclemark assumes no liability for property damage or injury occurred as a result of any of the information contained in this video. Use of this information is at your own risk. Unclemark recommends safe practices when working on vehicles and or with tools, lifting tools, jacks and or jack stands, chemicals and or lubricants or anything else seen or implied in this video. Due to factors beyond the control of unclemark, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or lost that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not of unclemark.
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🔧-You should consult a qualified mechanic for your repairs. Statements made in this video are not intended as mechanical advice.

[@LakesideAutobody]

Nice. Thanks for sharing Mark. Great video 🔥😊

[@unclemarksdiyauto]

@@LakesideAutobody I am so happy I got her keys to work at a really fair price. No issues so far and it’s been about 3 months already.

[@VideoNOLA]

Pro tip: Some public library systems offer Chilton manuals online or for checkout.

[@unclemarksdiyauto]

@@VideoNOLA Great tip! They can be very helpful for folks trying to do their own fixing.