Using this D4V2 Hidden Air Tag Cap Cover is easy. First, make sure you have an EMISAR D4V2 SST - 20 Torch, a suitable 18650 battery, and a charger. Put the air tag into the tail of the cap. Then, attach the cap to your torch. If your torch goes missing, use your device to locate the air tag and find your torch. When it comes to maintenance, keep the cap clean and dry. Avoid dropping or hitting it hard as it might damage the structure. Also, make sure to charge your air tag and battery regularly to ensure proper functionality.