SpecVexa

Which ports can actually carry a display signal, how to check DisplayPort Alt Mode on your own machine, and why a dock cannot add what the port lacks.

Wattage by device class, how multi-port chargers split power, the 100W and 240W ceilings, and the watt-hours maths airlines actually use.

Layouts drawn to scale so you can see what the number pad costs you in mouse room — plus how loud each switch type is on a call.

Port, cable, monitor input and the OS setting all have to agree before a high refresh rate appears. How to find which one is capping you.

A hub keeps part of the wattage, the cable caps the rest, and attached devices draw from the same budget. How to work out what the laptop actually receives.

Enter your laptop's wattage and what else you charge at once. Get the charger size, the cable rating, and whether a power bank can keep up.

Pick your port and laptop. See whether a portable monitor or triple-screen extender works, which cable to use, and the Mac limits nobody mentions.

Pick your laptop's port, the screen you want, and what else you plug in. See whether the video fits, what speed the hub's USB ports fall to, and what an external SSD will really do.

Enter the mAh on the label. See the watt-hours, whether it can fly in the US (100Wh / 160Wh), and how many times it charges a phone or laptop.

The most-bought portable monitors, screen extenders, hubs, chargers and keyboards we have reviewed, and what to check before a discount talks you into one.