How to Choose a Robot Vacuum: Suction, LiDAR, and Mopping
Robot vacuums split on four things: suction (Pa), navigation sensor, mopping style, and dock. Most homes are fine at 4,000Pa with LDS LiDAR; caked grime needs 2kg-plus rotating pressure.
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Wi-Fi 6 vs 6E vs 7: How to Choose a Router
The dividing line across the three generations is the 6GHz band. Wi-Fi 6 uses 2.4/5GHz, 6E adds 6GHz, and 7 layers on 320MHz, 4K-QAM and MLO for a theoretical 46Gbps. Here is where the speed actually comes from.
HDMI 2.1 vs 2.0: 4K 120Hz, 8K and Choosing the Right Cable
To run 4K 120Hz gaming, 8K or VRR you need HDMI 2.1 — and a certified Ultra High Speed cable. Bandwidth is 18Gbps versus 48Gbps. Here is the required bandwidth computed by resolution and refresh rate.
eSIM vs Physical SIM: Activation, Dual SIM, and Issuance Fees
An eSIM activates by QR without swapping a chip and costs 2,750 won to issue in Korea, versus 7,700 won for a physical SIM (USIM). This piece compares the two across activation, dual-SIM setups, device changes, and loss.
How to Choose a Gaming Mouse: Reading DPI, Polling Rate and Sensor
The real battleground in gaming mice is not the DPI number but weight, sensor and wireless latency. Here is a calculated look at the gap between 1000Hz and 8000Hz, with priorities by use case.
Mechanical Keyboard Switches Compared: Red, Blue, Brown, Black
Red is a light 45g linear that glides down, Blue is a loud 60g clicky, and Brown adds a 55g tactile bump. This guide compares actuation force, actuation point and noise, then walks through how to pick a switch by use case.
Bluetooth 5.3 vs 5.4: Why Your Earbuds Won't Sound Any Different
Bluetooth 5.4's new features — PAwR and Encrypted Advertising Data — were built for electronic shelf labels, not audio. What actually changes sound is LE Audio and the LC3 codec. Here is the real 5.3 vs 5.4 difference, straight from the official spec documents.
How to Choose a Power Bank: mAh, Rated Capacity, PD Output
A 20,000mAh pack won't charge your phone four times. Here is the gap between labeled and usable capacity (Wh conversion, conversion loss), PD output per device, and airline limits, worked out in numbers.
Dehumidifier Sizing Guide: How Many Liters You Need per Pyeong
Multiply the floor area of the room you dehumidify — 0.76L per pyeong (3.3㎡) for apartments, 1.02L for houses. A 20-pyeong living area needs a 15L class unit; laundry-drying in a closed room needs only 10L. Full sizing table inside.
Projector ANSI Lumens: How to Pick Brightness by Room and Screen Size
A projector's brightness should be read in ANSI lumens — light that reaches the screen — not raw lumens. A dark 100-inch room needs 1,500–2,500 ANSI; a lit living room needs 3,000+. Why 'LED lumens' inflate by 2x or more.