02 — Category
Measure first, then buy.
Guides is where I answer one buying question at a time — what size, which spec, which model — with a calculator, the official numbers behind it, and the sources so you can check them.
For earbuds without ear tips, the AirPods 5 has active noise cancellation (ANC) and sits in the ear. To keep the ear canal clear, the AeroFit 2 hooks over the ear and the AeroClip clips on the ear.
Assuming 60-70% efficiency over a cable, an iPhone 18 Pro needs 5,000mAh for an evening top-up and 10,000mAh to fill; a Pro Max is just barely covered either way. Choose 10,000mAh for an estimated full wired charge; magnetic charging can't promise one.
A 27-inch monitor can work on a 60 cm deep desk, but on its own stand it's borderline. Among current 27-inch models from major brands, on a 60 cm desk, a 27-inch up to 18.2 cm deep with its stand reaches the 56.72 cm target sitting back. The closer it is to that depth, the less room is left; right at that depth it's borderline. Worked out from official dimensions checked in October 2026.
Calculated for tablets on Amazon.com, bunko paperbacks (Japanese novels) show at paper size or larger on 8-inch tablets and B6 manga on 10-11-inch ones, both borderline at the smallest size. A4 PDFs show at about 64-75% of paper size on the 10-11-inch class, and models from 12.9 inches up reach 80% or more.
For calls in a noisy office, this guide picks the Bose QuietComfort Ultra Earbuds (2nd Gen), which Bose says reduces office chatter and wind on calls with AI. It lists 8 mics, but Bose doesn't say how many are for calls. This guide is based on the makers' official pages.
On a 3-day trip at 60% efficiency, if you can charge at the hotel each night, a phone alone just barely gets by on 10,000mAh. A tablet or handheld console needs 20,000mAh, and a laptop 25,000mAh. With no outlet for 3 days and a phone alone, carry 20,000mAh and 10,000mAh banks.
In this guide's method, pick a VALORANT monitor by your average in-match fps (frames the game draws per second). For refresh rate (how often the monitor redraws per second), 144Hz is enough at an average of 144 fps or less. Per Riot's official pages, the top spec target is 144 fps, and the in-game Stats display shows your fps. Checked against official pages and third-party data as of October 2026.
Per Nintendo's US support page, the Nintendo Switch 2 only works with microSD cards built to the SD Express standard, up to 2 TB. In this calculation, recording at up to 240 Mbps is covered by a V30 card (at least 30 MB/s). Above 216 Mbps up to 240 Mbps the headroom is under 10%, so it's borderline. Worked out from the SD Association's and the makers' official pages as of October 2026.
Per Mojang's requirements table, Java Edition recommends 16 GB of RAM and a CPU such as a Core i5-12400. The GPU should have 6 GB of VRAM (its own memory), such as a GeForce RTX 2060. The minimum is 8 GB of RAM (12 GB with integrated graphics), 2 GB of VRAM and a CPU with 4 physical cores.
Use an SSD for the OS, apps and games and a hard drive for big photo and video libraries. Includes a table by use, plus SSD lifespan and capacity math, from the makers' official pages as of October 2026.
Find out whether HDMI, DisplayPort or USB-C is enough for your resolution and refresh rate, worked out by data rate. In this calculation, HDMI 2.0 and DisplayPort 1.4 have enough bandwidth for 1080p at 60Hz. For USB-C, first check that your device supports DisplayPort Alt Mode.
Among current iPads, to draw A5 at actual size with Apple Pencil Pro (the pressure-sensing pen), you need an 11-inch-class screen or larger; at that size it's borderline. On 13-inch-class models, both the screen's long and short sides exceed A5's by at least 48.5 mm, counting the room on both edges together. No current iPad shows a whole A4 page (210 × 297 mm) at actual size. Worked out from Apple's diagonal and resolution, even the largest 13-inch screen is only about 264.1 × 198.1 mm.