Samsung 55 Inch Crystal UHD UA55DU7000USWK 4K Smart TV Tizen OS Knox Security Endless Free Content

Samsung 55 UA55DU7000USWK is a 55-inch 4K UHD smart television in Samsung’s “Crystal UHD” range — offering a balance of size, smart features and image quality for everyday viewing in a living-room.

Visual & Display Highlights

• With a resolution of 3840 × 2160 (4K UHD), it delivers four times the detail of Full HD. 

• It uses Samsung’s Crystal Processor 4K, which aims to upscale lower-resolution content toward 4K and enhance colour and contrast. 

• HDR support includes HDR10+, boosting dynamic range (brighter brights, deeper shadows) for compatible content. 

• Motion technologies such as Motion Xcelerator help smooth fast‐moving content (sports, action, gaming) and gaming features like ALLM, VRR and HGiG are also supported in many listings. 

• The design is “Slim Look” with narrow bezels (3-sides almost bezel-less in some markets) for a modern aesthetic. 

Smart & Connectivity Features

• The smart TV platform is Samsung’s Tizen OS, which provides access to streaming apps (Netflix, YouTube, etc.), built-in free content/live channels via Samsung TV Plus, and integrated smart-home functions via SmartThings. 

• Security: An important highlight is Samsung Knox Security, which protects your data, home-IoT devices and blocks malicious apps/links — giving extra peace of mind. 

• “Endless Free Content”: Through Samsung TV Plus or other built-in offerings, you get a range of free live & on-demand channels without additional subscription fees. 

• Connectivity includes WiFi (WiFi 5 in most markets), Bluetooth (often 5.2), multiple HDMI ports (including eARC) and USB. 

Audio & Other Features

• The speaker system on this model offers ~20 W RMS output in a 2-channel configuration in many regions. While not premium home theatre level, it’s adequate for everyday viewing. 

• Audio features such as OTS Lite, Adaptive Sound, and Q-Symphony (for pairing with compatible Samsung soundbars) help enhance the audio experience. 

• Additional features: 4K upscaling, Filmmaker Mode in some markets (preserves director’s intent), mobile to TV mirroring, SmartThings hub features (e.g., IoT device control) etc. 

Considerations / Trade-offs

• While the 4K resolution and smart features are strong, the panel refresh rate in many markets is listed as 50 Hz (or 60 Hz) rather than a native high refresh rate 120 Hz. If you’re using it for high-end gaming (4K @120 Hz) you may want to check port and panel specs carefully. 

• Built-in audio is moderate; for a large living-room or cinema-style sound you may still want a separate soundbar/sub.

• As with any large-screen TV, placement, viewing distance, ambient light and calibration will affect the perceived quality.

• Free content via Samsung TV Plus and built-in services is great, but availability and breadth depend on region; check local service versions.

Specifications Table

Here is a consolidated specification table for the Samsung 55DU7000, based on available public-market listings. Note: specs may vary slightly by region.