I love having the power to find a lost or stolen object using Apple's Find My technology, and I and the members of my family own multiple AirTags. But an AirTag is too big for your wallet. For the last six months, I've been trying out two products that work similarly to an AirTag but that are thin and flat enough to fit in a wallet. First, I started using the Rolling Square AirCard, which I originally backed in a Kickstarter campaign and which you can now purchase on Amazon for $29.90. More recently, I started using a Eufy SmartTrack Card, which is normally $29.99 but which you can currently buy on Amazon for only $16.99 — a fantastic price, so I urge you to buy one quickly before the price goes back up. The core features are similar, but there are some differences between the two products. I prefer the Eufy SmartTrack Card, but my 18-year-old son prefers the Rolling Square AirCard.
The key feature: find your wallet and get notified if you left it behind
The #1 reason to get either of these products is to find your lost wallet and be notified if you left it behind.
Both products let you use the "Add Other Item" feature in the iPhone's Find My app to add the card so that it appears in the same place in the app as your AirTag and other trackers. Using a map, you can see where the card is currently located. Like an AirTag, these cards lack GPS, but they have Bluetooth, so if any iPhone is in the vicinity of the card, you can get a rough sense of where your card is located. For example, if you go to work and leave your wallet at home with one of these cards in the wallet, you can use use the Find My app to see (1) the last time that the wallet was seen at home (the time when your iPhone was last at home and the card could "see" it via Bluetooth) or (2) the last time that any other iPhone was in the vicinity of the card. So if someone else is in your house, or perhaps even if your wallet is near the front of your house and someone walks by your house with an iPhone, you may be able to see that your wallet was at your house as of just a minute ago.
Both products also help you to find your wallet if you are in the vicinity but cannot find it. Just the other day, I forgot that I had left my wallet in my study. When I went to leave my home and could not find my wallet, I opened the Find My app, selected the card that was in my wallet, and instructed the Find My app to make the card play a sound. My son, who was in the study at the time, immediately yelled that my wallet was in that room. But if he had not been around, I could have just walked around my house until I heard the beeps coming from the card.
Both products also help to prevent you from leaving your wallet behind. You can enable a function in the Find My app to give you a notification if you left the card behind where you are located (with "you" in this case being the place where your iPhone is located). The notification takes a few minutes, so you may be several blocks away before you are alerted that you left your wallet at a restaurant. But that is better than going home and not realizing that your wallet was left in the restaurant until after the restaurant has closed. You can designate certain locations—such as your home—so that you will not receive a notification if your card is left there.
These key features are great, and they work well with both of these products.
Size and weight
Everything that I just described can also be done with an AirTag. What makes these cards different from an AirTag is their size and weight.
A credit card and a driver's license are mandated to use the dimensions 3.375 inches wide by 2.125 inches high. Both of these tracking cards are that same width and height. In the next two pictures, the Eufy product is at the top and the Rolling Square product is at the bottom:
The ISO requirement for credit card thickness is .76 mm (0.0299 inches). These tracking cards, however, are about three times that thick: about 2.2 mm / 0.09 inches. So by adding one of these tracking cards to your wallet, it is like adding almost three credit cards. By comparison, an AirTag is about 8 mm / 0.31 inches.
Credit card weight varies, with a plastic card around 5 grams and a metal card between 13 and 18 grams. This is a measurement on which these two tracking cards differ. The Rolling Square AirCard weighs about 20 grams whereas the Eufy SmartTrack Card weighs around 18 grams. More importantly, the Eufy card FEELS like it weighs even less, closer to the almost nothingness weight of a business card. I'm not sure why this is so noticeable if it is only a 2 gram difference. Perhaps it is because the Eufy card is surrounded by plastic whereas the Rolling Square product has a glass shell.
I want as little weight as possible in my wallet, and I like the reduced weight and the feel of the Eufy product. My son, on the other hand, also has a Rolling Square AirCard, and he told me that he prefers the feel and look of that product with its glass (see-through in places) and more of techno look to it.
Battery Life
One reason that these two products are smaller and lighter than an AirTag is that there is no replaceable battery. Both devices have a battery sealed inside that should last about 2.5 years or so.
When the Rolling Square AirCard dies, Rolling Square says that you can send back your dead AirCard and get a 50% discount on the purchase of a new one, plus they will recycle the unit you send in. Eufy doesn't offer a similar service, but considering how inexpensive the product can be (currently $16.99) it isn't very expensive to purchase a new one.
Additional features of the Eufy SmartTrack Card
If you download the free Eufy Security app—an app that I've been using for a long time to work with the Eufy security cameras outside of my home—you gain three more features.
First, if you have a SmartTrack Card but you cannot find your iPhone, you can double-tap the button on the SmartTrack Card to make the Eufy Security app on your phone make noise—even if your iPhone is in silent mode. It plays a version of the B-I-N-G-O song, and if there is a way to change that song, I haven't found it yet. If you already own an Apple Watch, you won't need this feature because the Apple Watch can be used to track down an iPhone.
Note that you don't want to make your iPhone play noise by accident, so the app also has a False Press Prevention mode. This mode turns on automatically 12 hours after you connect the SmartTrack Card. In this mode, if you long press on the button—for example, you sit on your wallet in a way that causes the button to press in—then no sounds will play. This seems like a good precaution to add.
Second, the back of the SmartTrack Card has a QR code, and if you ever lose the card, perhaps someone will pick up the card and scan the QR code to see what happens. If someone does so, and if you have Lost Mode turned on in the Eufy app, then scanning the QR code will lead to a webpage that displays whatever information you choose to provide (if any) in the following fields: Name, Email, Phone, Message. Thus, you can provide your name and phone number and add a message to ask them to call you so that you can get your SmartTrack Card back—and hopefully, your wallet too if it was also lost.
Third, you can optionally choose to let other family members track the the SmartTrack Card using the Eufy app on their iPhone. Note that iOS 17 added the ability to share an AirTag or other item with another person, so this is similar to that except that it uses the Eufy app instead of the Find My app.
Note also that a Eufy SmartTrack card comes with a metal clip that you can (optionally) attach to the card. For me, that removes the key advantage of this product: it is similar to a credit card and can be slipped in a wallet with other cards. But if you want to attach the thin Eufy SmartTrack card to another item, you may find the clip useful.
Additional features of the Rolling Square AirCard
Like the Eufy SmartTrack card, the Rolling Square AirCard has a QR code on it that can be scanned. This is called the Advanced Lost Mode feature, and it allows someone who finds your AirCard and scans the QR code on it to contact you. Rolling Square uses the Sherr.it service for this, which provides certain information about you that you provide.
Second, there is an NFC tag built-in to the back of the AirCard. Tap that spot on your AirCard on top of someone else's iPhone and that iPhone will go to the same Sherr.it website to get information on you. Rolling Square advertises this as a digital business card; you tap your AirCard with someone else's iPhone and then they can add you to their contacts. This is somewhat similar to the NameDrop feature that Apple added in iOS 17.
Just like other NFC tags, this NFC tag can also be programmed to do other things, and my son likes being able to program the NFC tag to do various things.
Third, Rolling Square notes that the AirCard can act as an RFID blocker. If you place the AirCard as the outer-most item in your wallet with other credit cards beneath them, signals are blocked before they can get to your credit cards.
Conclusion
With the Eufy SmartTrack card currently almost half the price of the Rolling Square AirCard, it seems like an easy decision to get the Eufy product over the Rolling Square one. This discount may not last long, but I see from the Camel Camel Camel website that this same discount has been offered many times in the past, so I presume it will come back in the future. I also prefer the look and weight of the Eufy product, but consider whether you, like my son, prefer the look of the AirCard and the NFC and RFID features.
Whichever ever one you get, I strongly recommend that you get one of these products for your wallet—whether you carry it in your purse or in a back pocket or elsewhere. You know that, at some point, there is going to be a time when you cannot find your wallet, and this device can come to the rescue. Hopefully, it will just be misplaced in your own home or office while you are still in that location. However, if you left your wallet behind, after you left, either of these devices can notify you using Find My technology. And if someone finds your lost card and scans the QR code, maybe that will be how you recover your wallet. (Note that I use affiliate codes when I link to Amazon, so by using links in this post to make a purchase, a tiny portion of your sale price goes to help pay the costs associated with keeping the lights on here at iPhone J.D.)
Click here to get Eufy SmartTrack card from Amazon (currently $16.99).
Click here to get Rolling Square AirCard from Amazon (currently $29.90).
