The eufy E340 and the wired S330 are close cousins. Both have two cameras, 2K video, 8GB of storage on the doorbell, and no required subscription. The real split is power: the E340 runs on a removable battery or your doorbell wiring and adds color night vision, while the S330 is hardwired only and needs a stronger transformer. Pick the E340 if you have no doorbell wires or an older transformer, and the S330 if your wiring already meets its requirements.
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eufy E340 vs S330: Which Video Doorbell Should You Buy?
eufy E340 vs S330: The Key Differences
The E340 runs on battery or wires; the S330 needs wires
The E340 has a detachable, rechargeable battery, so you can mount it on a door with no doorbell wiring at all. If you do have wiring, you can connect it too, and eufy says the battery has to stay installed even in wired mode.
The S330 is hardwired only. There is no battery inside, so it needs working doorbell wiring to run.
The S330 needs a stronger transformer
This is the difference most likely to matter at install time. eufy lists the S330 at 16–24V AC with a transformer rated 30VA or higher, and it warns that older, lower-powered transformers such as 16V 10VA units may not be enough.
The E340 is easier to please. eufy’s spec sheet lists existing doorbell wiring at 16–24V and 10VA, or a 19V DC power adapter. If your house has an older, low-power doorbell transformer, the E340 is the safer bet.
Only the E340 has color night vision
eufy’s own comparison table gives color night vision to the E340 and not to the S330. The E340 uses a dual-light system with a night viewing range of up to 16 feet.
HomeBase support is different
The E340 can work on its own or pair with eufy HomeBase 2 or HomeBase 3. The wired S330 records to its own 8GB of storage, and eufy’s HomeBase compatibility guide lists it as not compatible with HomeBase 2 or 3, so plan on the doorbell’s own storage.
What they have in common
Both doorbells have a 2K front camera plus a 1080p downward camera that watches packages on your doorstep. Both offer human, package, and face detection, two-way audio, 8GB of storage on the doorbell, 2.4GHz Wi-Fi, and IP65 weather resistance, and both work with Alexa and Google Assistant. Neither works with Apple HomeKit. Neither needs a monthly plan to record and play back video, though eufy sells optional cloud backup. If you’re on the fence about cloud plans, see our guide on whether a smart doorbell needs cloud storage.
eufy E340 vs S330 Comparison Table
| Feature | eufy E340 | eufy S330 (Wired) |
|---|---|---|
| Cameras | 2K front + 1080p package camera | 2K front + 1080p package camera |
| Front camera viewing angle | 160° | 160° |
| Power | Removable battery or hardwired | Hardwired only |
| Wiring requirement | 16–24V, 10VA or higher (or a 19V DC adapter) | 16–24V AC, 30VA or higher |
| Color night vision | Yes, up to 16 ft | No color night vision |
| Local storage | 8GB on the doorbell | 8GB on the doorbell |
| HomeBase | Works with HomeBase 2 and 3 | Not compatible, per eufy’s guide |
| Wi-Fi | 2.4GHz only | 2.4GHz |
| AI detection | Human, package, face | Human, package, face |
| Weather rating | IP65 | IP65 |
| Smart assistants | Alexa, Google Assistant (no HomeKit) | Alexa, Google Assistant (no HomeKit) |
| Subscription | Not required | Not required |
eufy Video Doorbell E340 Details
The E340 is the flexible one. Its removable battery lets renters and anyone without doorbell wiring install it with a few screws, and the wired option is there if you have wires. You also get color night vision, which the S330 lacks.
Product Features:
- Two cameras: 2K front camera and a 1080p downward package camera
- Removable rechargeable battery, or hardwire to 16–24V, 10VA doorbell wiring
- Color night vision up to 16 feet
- 8GB of storage on the doorbell, no subscription required
- Works on its own or with HomeBase 2 and HomeBase 3
- Human, package, and face detection
eufy Video Doorbell (Wired) S330 Details
The S330 is the hardwired version of the same dual-camera idea. If your doorbell wiring and transformer are up to spec, it gives you the same 2K front camera, package camera, and AI detection without a battery to recharge.
Product Features:
- Two cameras: 2K front camera and a 1080p downward package camera
- Hardwired only: 16–24V AC with a 30VA or higher transformer
- 8GB of storage on the doorbell, no subscription required
- Chime included, and works with existing mechanical chimes
- Every event starts with a 3-second preview
- Human, package, and face detection
eufy E340 vs S330: Which One Should You Buy?
Buy the E340 if you don’t have doorbell wiring, you rent, your transformer is an older 10VA unit, or you want color night vision. It’s the easier doorbell to install in more homes.
Buy the S330 if you already have healthy doorbell wiring with a 30VA transformer and you never want to think about a battery. On the features you’ll use every day, like the package camera and person alerts, the two are very close.
eufy E340 vs S330: Which Video Doorbell Should You Buy? FAQ
Does the eufy E340 need doorbell wiring?
No. The E340 runs on its removable rechargeable battery, so wiring is optional. If you do connect it to doorbell wiring, the battery still has to stay installed.
Can the eufy S330 run on battery?
Not the wired S330. It is hardwired only and needs 16–24V AC doorbell wiring with a 30VA or higher transformer. eufy sells a separate battery-powered S330 that works with a HomeBase, so check the model name before you buy.
Do the E340 and S330 both have a package camera?
Yes. Both have a 2K front camera plus a 1080p downward camera aimed at your doorstep, so you can see packages left right at the door.
Do you need a subscription for the eufy E340 or S330?
No. Both record to 8GB of storage built into the doorbell, and you can watch recordings without paying a monthly fee. eufy’s cloud backup is optional.
Which eufy doorbell has better night vision?
The E340. eufy lists color night vision for the E340, with a range of up to 16 feet, and not for the S330.
In Summary
For most people the E340 is the better pick because it installs almost anywhere and adds color night vision. The S330 makes sense if your doorbell wiring already meets its 30VA requirement and you’d rather skip the battery. Check your transformer before you buy, since that one spec decides which of these two will work at your door.
