The “ten essentials” is a common way of referring to items that one should always carry in the wilderness for an emergency. These are items that will help you cope with difficulties that could turn into life-threatening situations. For example, you can carry a compass and map to avoid getting lost, but also a headlamp, so you are able to see the compass and map if you require navigation at night or an altimeter if you are in a whiteout.
UPDATE: After the initial correspondence and information about possible product defects, Pieps issued a voluntary recall on Apr 12, 2021. The recall email is at the end of this post.
You may have heard some controversy about the switch failing on the Pieps DSP Sport Avalanche Transceivers, especially when used incorrectly. There are now many videos showing the issues, such as this one. Pieps is a company owned by Black Diamond. I received a letter from REI (below) and have decided to post it here for anyone who may find it of interest. It includes an important Instagram safety video link (https://www.instagram.com/p/CGT6EzAlgLn/) from Pieps. If you’re using an older Pieps Transceiver, watch this video because it provides important use and inspection information about the devices that every user needs to know.