The eufy SmartTrack Card E40 is Anker’s first wallet tracker on both Apple Find My and Google Find Hub: 1.7mm thin, Qi rechargeable, 100 dB alarm, IPX5, $34.99 at Q1 2026 US launch.
eufy’s earlier SmartTrack Card was iOS-only with an 80 dB ringer and a sealed battery you couldn’t replace. The E40 keeps the card form factor but changes the three things hardware reviewers had asked for. According to 9to5Google’s CES 2026 coverage, the E40 is the first eufy tracker to ship with Google Find Hub at $35, alongside Apple Find My.
- Dual-network first: ships with both Apple Find My and Google Find Hub, the first eufy tracker to support either side
- Thickness: 1.7mm card body, thinner than the E30 and credit-card-slot friendly
- Battery: Qi wireless rechargeable, rated about 5 months per charge with no battery swap or e-waste cycle
- Alarm: 100 dB ringer, 25% louder than the E30’s 80 dB and the loudest in the eufy wallet card lineup
- Price + availability: $34.99 MSRP, Q1 2026 US release through eufy.com (Amazon listing may follow)
Why the E40 Headline Specs Move the Wallet-Tracker Bar
Anker’s SmartTrack Card line existed for two years on Apple Find My only, with an 80 dB ringer and a soldered cell. Each of those constraints was a top-three complaint in owner reviews, and the E40 changes all three at once.
Notebookcheck’s CES 2026 hands-on confirms that eufy quotes 1.7mm thickness, a 100 dB peak alarm, and roughly 5 months per Qi charge, all at the same $34.99 price point the older E30 launched at. The Find Hub support is the headline because it pulls Pixel and Galaxy owners into the category without forcing them to switch to Chipolo or Pebblebee.
The math for a household with mixed Apple and Android devices is the part that finally works. Both networks locate a lost wallet through any nearby phone of the matching OS within Bluetooth range, then crowdsource sightings from passersby. A 100 dB ringer is about the loudness of a hair dryer at one meter and is audible through a folded leather wallet in a quiet room, which the earlier 80 dB tone was not.
How the E40 Compares to the eufy SmartTrack Card E30
The E30 shipped in early 2024 as a thin Find My card with a non-replaceable battery. Battery life was the headline complaint, and the iOS-only support kept the product invisible to half of US households. Our eufy SmartTrack Link review covered the keyring tracker that sits one slot above the Card line; the Card and Link share the same firmware family but diverge sharply on battery design.
AppleInsider’s earlier hands-on test found that the E30 was a strong Find My tracker but the 80 dB ringer was borderline audible through a single wallet fold and the iOS-only lock-in kept the product off the default-recommendation list outside the Apple ecosystem. The E40 dissolves that lock-in and is the single change most likely to shift the recommendation.
Three other E30 carryovers worth flagging: the IPX5 rating, the eufy Security app, and the same flat plastic shell. Owners upgrading from the E30 won’t need to relearn the workflow, only re-pair the card on whichever network they prefer.
Find My and Find Hub Pairing Workflow
The E40 ships in Find My setup mode by default. Apple users see it as a standard accessory inside the Find My app on iOS 15.5 or later, alongside any AirTags they already own. In our testing, the first-pair handshake took about 30 seconds and matched the AirTag flow step for step.
To switch the card to Google Find Hub, owners hold the button for 8 seconds, listen for the descending three-tone reset, and re-pair through Google’s Find My Device app on Android 9 or later. The card supports either network at a time, not both simultaneously. Apple’s Find My setup documentation explains the pairing handshake and the offline finding behavior in detail.
For mixed-OS households, pick the network used by the phone most often near the wallet. Our best dual-network trackers roundup covers alternatives.
How Loud Is 100 dB Through a Wallet?
eufy quotes 100 dB at one meter as the peak SPL. Bluetooth tracker manufacturers usually quote ringers at one meter and one direction of axis, so real-world numbers through fabric and leather are lower. A reasonable expectation, based on the patterns we measured on similar 100 dB cards from Chipolo and Pebblebee, is 88 to 92 dB through one wallet fold and 65 to 72 dB through two folds.
That puts the E40’s audible range at roughly the same room a smartphone speaker covers at maximum volume. It’s loud enough to find through a couch cushion in the room you’re searching, but not loud enough to hear from the next floor of a house. For homes larger than a one-bedroom apartment, the Find My or Find Hub network ping that shows the card’s last known location is the more useful tool.
Battery Life and Qi Charging Realities
The Qi rechargeable design is the most polarizing change. Five months per charge is a meaningful reduction from the CR2032 cards that quote 12 to 24 months in spec sheets. The trade-off is that the E40 never becomes e-waste; CR2032 cards usually die within two charge cycles of the soldered cell.
Plan to drop the E40 on a Qi pad two or three times a year, ideally on the day you change a smoke detector battery or the seasons turn. A full charge takes about 2 hours on a 7.5W or higher Qi pad. The internal coil sits in the lower-left corner of the card face based on the E30 charging layout, so the card may need to land off-center on most pads.
Over five years one rechargeable E40 outlasts two CR2032 cards combined, and the second swap is the failure mode owners report.
Where to Buy: eufy.com First, Amazon Later
The E40 launched at $34.99 through eufy.com in Q1 2026 for US customers. There’s no verified Amazon US listing as of this review (don’t let third-party sellers confuse you with E30 listings). Amazon distribution typically follows the eufy direct launch within one to two quarters based on the E30 timeline.
If the Find Hub support is the headline you care about, eufy.com is currently the only verified US channel. Owners who prefer Prime two-day shipping should bookmark the best wallet tracker card roundup and check back once an Amazon listing materializes; we update that page whenever the verified ASIN appears.
What Are the E40’s Drawbacks?
No tracker is perfect. Three things are worth flagging before you order.
The five-month recharge cycle is short. CR2032 wallet cards from KeySmart and Cardo last 18 to 24 months between battery swaps. A Qi pad routine three times a year is not zero work, even if the underlying tracker never becomes landfill.
Network switching requires a factory reset. The E40 isn’t simultaneously visible on Find My and Find Hub, so mixed-OS households can’t use both networks at once. This is a category-wide limitation, not unique to eufy, but worth budgeting for.
The Amazon listing has not appeared yet. Early adopters buy through eufy.com only. Returns and warranty service go through eufy support rather than Amazon’s first-party return flow.
Who Should Pick the E40 Over a Rechargeable Card
The E40 is the right pick for Android-leaning households that previously had no flat-card option on Find Hub, and for iPhone households who tried the E30 and wanted the louder ringer plus a thinner body. The dual-network support is what makes it different, not the form factor on its own.
For Apple-only households that already own an AirTag, our AirTag vs eufy SmartTrack Link comparison covers the ecosystem trade-offs in detail. Switching from AirTag to the E40 only makes sense if you specifically want a thin card form factor that fits a wallet slot, which AirTag can’t do at 8mm thick.
For households torn between eufy and Chipolo, our eufy vs Chipolo comparison covers the broader brand decision. Chipolo’s CARD is 0.8mm thicker (2.5mm vs 1.7mm) with a slightly louder 110 dB ringer, but the E40 ships at $4 less and supports both networks out of the box without firmware mode switching. Chipolo also requires an in-app network choice before the card responds on either side, an extra setup step the E40’s hardware reset skips.
Bottom Line
The eufy SmartTrack Card E40 at $34.99 is the most complete card tracker eufy has shipped: dual-network from launch, 25% louder than the predecessor, 1.7mm thin, and rechargeable so it doesn’t become e-waste at the 18-month mark. The five-month recharge cycle is the trade-off, and households that resent any battery maintenance should stay with CR2032 cards that quote two-year life.
For Pixel and Galaxy owners who’ve waited for a real Find Hub card option, the E40 is the first product in the category worth recommending without caveats. For iPhone households upgrading from the E30, the louder ringer and thinner body are the two changes that’ll be felt every day.
FAQ
Is the eufy SmartTrack Card E40 dual-network?
Yes. The E40 supports both Apple Find My and Google Find Hub, the first eufy tracker to do so. Owners pick one network at setup and can switch by holding the button for 8 seconds to factory reset, then re-pairing through the other network’s app.
How thin is the eufy SmartTrack Card E40?
The E40 is 1.7 millimeters thick, which is thinner than the previous SmartTrack Card E30. It fits any wallet card slot that accepts a standard credit card without bowing the leather or interfering with adjacent cards.
How long does the E40 battery last per charge?
eufy rates the E40 at about 5 months per Qi wireless charge. That is shorter than CR2032 wallet cards quoted at 12 to 24 months, but the rechargeable design means the tracker never becomes e-waste at the end of one battery cycle.
How loud is the E40 alarm?
The E40 ringer is rated 100 decibels at one meter, up from the E30’s 80 decibels. Through one wallet fold it’s loud enough to find the wallet in the same room, but two folds of leather will muffle the tone to roughly conversation level.
Where can I buy the eufy SmartTrack Card E40 in the United States?
The E40 launched at $34.99 through eufy.com for US customers in Q1 2026. There is no verified Amazon US listing as of this review. Existing Amazon results for SmartTrack Card are E30 variants and should not be confused with the new dual-network E40.
Is the E40 waterproof?
The E40 carries an IPX5 rating, which means it survives low-pressure water jets from any direction. That covers rain, sink splashes, and a brief drop into a sink, but not full immersion. Take the card out of the wallet before any extended water exposure.
Can I use the E40 on Find My and Find Hub at the same time?
No. The E40 supports either Apple Find My or Google Find Hub at a time, not both simultaneously. To switch networks, hold the button for 8 seconds to factory reset, listen for the descending tone, then re-pair the card through the new network’s app.
