PoE Bullet-PTZ Cam S4 vs PoE Bullet Cam E40: Key Differences

Two wired cameras, two coverage strategies

The eufy PoE Bullet-PTZ Cam S4 and the eufy PoE Bullet Security Camera E40 share a foundation: both are add-on cameras that work exclusively with the eufy NVR S4, both need a PoE NVR, switch, or injector (and a DC adapter where noted), and both use AI to distinguish people, pets, and vehicles. The real decision comes down to how much of a scene you need to cover and how you want to cover it. The S4 adds a moving PTZ lens for auto-tracking; the E40 stays fixed at 4K. Neither is a standalone camera, so your existing or planned NVR S4 setup is the first box to tick.

Resolution and field of view: triple-lens vs single 4K

The S4 pairs a 4K wide-angle upper camera with a 2K PTZ lower camera, giving you a fixed overview plus a zoomable, moving view. The E40 delivers a single 4K wide-angle picture. If you need to identify a face or plate at a distance, the S4's 8× auto-zoom and 360° pan can help; if you just need a steady, high-resolution record of a wide area, the E40 is simpler.

• eufy PoE Bullet-PTZ Cam S4: 16 MP triple-lens system: upper 4K wide-angle camera with 122° fixed view, lower 2K PTZ camera with 8× auto-zoom and 360° pan. Auto-framing and group tracking lock onto subjects up to 164 ft away.
• eufy PoE Bullet Security Camera E40: Single 4K UHD camera with a 122° wide-angle field of view. No pan, tilt, or zoom—just a fixed, high-resolution view.

Tracking and deterrence: what the S4 adds

The S4's headline feature is auto-framing and group tracking: when the bullet camera detects a subject, the PTZ locks on and follows them in centered close-ups until they leave the scene. Both cameras offer red and blue strobe alerts and smart sirens, but the S4's moving lens can keep a subject in frame as they move across your property. The E40 relies on its wide 122° view to capture action without mechanical movement, which means fewer moving parts but also less ability to zoom in on a distant subject in real time.

Night vision and audio: shared strengths

• eufy PoE Bullet-PTZ Cam S4: Starlight Color Night Vision with AI-ISP processing—no spotlight needed. You get color detail at night without adding a separate light, which can help identify people or vehicles.

  

• eufy PoE Bullet Security Camera E40: Starlight Color Night Vision with AI-ISP processing, no spotlight required. The E40 matches the S4's color night vision, so low-light performance isn't a differentiator here.

  

• eufy PoE Bullet-PTZ Cam S4: Two-way talk with AI noise reduction filters background noise for clearer conversation. Useful for communicating with visitors or deterring intruders without shouting over ambient sound.
• eufy PoE Bullet Security Camera E40: Crystal-clear two-way talk with AI noise reduction on both microphone and incoming audio. The E40 also offers clear two-way audio, so audio quality is comparable between the two.

Weatherproofing: IP65 vs IP67

The S4 carries an IP65 rating, while the E40 is rated IP67. Both are designed for outdoor use, but IP67 offers a higher level of dust and water resistance. If your installation spot is exposed to heavy rain, snow, or dust, the E40's IP67 rating may give you extra peace of mind. The S4's IP65 rating is still robust for typical outdoor conditions, but it's a difference worth noting if you live in a harsh climate.

Compatibility and power: both need the eufy NVR S4

• eufy PoE Bullet-PTZ Cam S4: Add-on camera designed to work exclusively with eufy NVR S4; cannot function on its own. PoE NVR, switch, injector, and DC adapter required (not included). Confirms the S4 is not a standalone camera—you must have the NVR S4 and the necessary PoE equipment.
• eufy PoE Bullet Security Camera E40: Add-on camera designed to work exclusively with eufy NVR S4; cannot function on its own. PoE NVR/switch/injector needed; DC adapter not included. The E40 has the same NVR requirement and power needs, so your existing PoE setup will work for either camera.

Which one fits your setup?

Choose the S4 if you need to actively track movement across a large area—such as a long driveway, a side yard, or a business entrance—and want the ability to zoom in on subjects up to 164 ft away. Its dual-lens design gives you both an overview and a moving close-up. Choose the E40 if you want a simpler, fixed 4K view of a wide area, need the higher IP67 weatherproofing, and don't require pan-tilt-zoom functionality. Both cameras integrate with the eufy NVR S4 and share AI detection, color night vision, and two-way talk, so your decision ultimately comes down to coverage style and environmental durability.