The LG UltraGear 27G521B-B is a 27-inch Full HD gaming monitor featuring an IPS display with a 1920 × 1080 resolution and 16:9 aspect ratio. It delivers a maximum 200Hz refresh rate for fluid motion and a 1ms GTG response time for sharper transitions during fast-paced gameplay. The display provides up to 99% sRGB color coverage and supports HDR10 for compatible content.

For gaming, the monitor supports both AMD FreeSync Premium and NVIDIA G-SYNC compatibility to help reduce screen tearing and stuttering when paired with compatible graphics hardware. LG also includes Dynamic Action Sync for reduced input lag, Black Stabilizer for improved visibility in dark scenes, and a Crosshair feature designed to assist with aiming in first-person shooter games.

The monitor uses a slim-bezel design and a compact L-shaped stand with tilt adjustment. It supports a 100 × 100 mm VESA mounting pattern for compatible monitor arms and wall mounts. The IPS panel provides 178° horizontal and vertical viewing angles, while the 27-inch display provides a larger viewing area for gaming, entertainment, and everyday computing.

Connectivity includes two HDMI 2.0 inputs, one DisplayPort 1.4 input with DSC support, and a 3.5mm headphone output. The monitor is finished in black and is designed as part of LG's UltraGear G5 gaming series. LG's official specifications confirm the 200Hz refresh rate, 1ms GTG response time, IPS panel, HDR10, up to 99% sRGB coverage, AMD FreeSync Premium, NVIDIA G-SYNC compatibility, and the listed connectivity.

GENERAL
Manufacturer: LG Electronics
Brand: LG
Series: UltraGear
Product Name: UltraGear G5
Model: 27G521B-B
U.S. Model Number: 27G521B-B.AUSQ
Display Category: Gaming Monitor
Display Type: IPS LCD
Panel Type: IPS
Screen Shape: Flat
Screen Size: 27 Inches
Resolution: Full HD (1920 × 1080)
Aspect Ratio: 16:9
Color: Black
Surface Treatment: Anti-Glare
Screen Size: 68.4 cm
Year: 2026

DISPLAY
Screen Size: 27 Inches
Panel Technology: IPS
Resolution: 1920 × 1080 (Full HD)
Refresh Rate: 200Hz
Response Time: 1ms (GtG)
Brightness: 250 cd/m² (Typical)
Brightness: 200 cd/m² (Minimum)
Contrast Ratio: 1000:1 (Typical)
Contrast Ratio: 700:1 (Minimum)
Color Gamut: sRGB 99% (CIE1931, Typical)
Color Gamut: sRGB 94% (CIE1931, Minimum)
Color Depth: 8-bit
Color Support: 16.7 Million Colors
Pixel Pitch: 0.3108 × 0.3108 mm
Viewing Angle: 178° Horizontal / 178° Vertical
Surface Treatment: Anti-Glare

HDR
HDR Support: HDR10
HDR Effect: Yes

GAMING FEATURES
Refresh Rate: 200Hz
Response Time: 1ms (GtG)
AMD FreeSync: FreeSync Premium
NVIDIA G-SYNC: G-SYNC Compatible
Variable Refresh Rate: Yes
Dynamic Action Sync: Yes
Black Stabilizer: Yes
Crosshair: Yes
FPS Counter: Yes
Auto Input Switch: Yes
User Defined Key: Yes

PICTURE FEATURES
Reader Mode: Yes
Flicker Safe: Yes
Color Weakness Mode: Yes
Smart Energy Saving: Yes

DESIGN
Bezel Design: 3-Side Virtually Borderless
Stand Design: Clutter-Free L-Stand
Display Position Adjustment: Tilt

CONNECTIVITY
HDMI: 2 × HDMI 2.0
DisplayPort: 1 × DisplayPort 1.4
Headphone Out: 1 × 3-Pole Headphone Output
DisplayPort DSC: Supported
Audio Output: Headphone Output

POWER
Power Supply: External Power Adapter
AC Input: 100–240V, 50/60Hz
DC Output: 19V / 1.7A
Power Consumption, Sleep Mode: Less than 0.5W
Power Consumption, DC Off: Less than 0.3W

ERGONOMICS
Tilt Adjustment: Yes
Height Adjustment: Not Specified by LG for 27G521B-B
Swivel: Not Specified by LG for 27G521B-B
Pivot: Not Specified by LG for 27G521B-B
VESA Mount: 100 × 100 mm
Wall Mountable: Yes

PHYSICAL SPECIFICATIONS
Dimensions With Stand: 612.7 × 462.7 × 220.9 mm
Dimensions Without Stand: 612.7 × 361.6 × 37.6 mm
Weight With Stand: 4.5 kg
Weight Without Stand: 3.4 kg
Shipping Weight: 5.7 kg

ACCESSORIES
HDMI Cable: Yes
HDMI Cable Length: 1.5 m
Power Cord: Yes
Power Adapter: Yes

WARRANTY
U.S. Labor Warranty: 1 Year
U.S. Parts Warranty: 1 Year

OFFICIAL IDENTIFICATION
Manufacturer: LG Electronics
Series: UltraGear
Model: 27G521B-B
U.S. Model: 27G521B-B.AUSQ
Product Type: 27-inch UltraGear G5 IPS FHD 200Hz 1ms Gaming Monitor