10 Spec-Sheet Numbers That Don’t Mean What You Think

Many TVs advertise numbers such as “Motion Rate 120” or “TruMotion 240.” These are brand-specific figures that combine the panel’s real refresh rate with image processing. The number that matters is the native refresh rate, usually 60Hz or 120Hz and sometimes higher.

A native 120Hz panel handles fast motion better and can show 120 frames per second from recent consoles and PCs. A 60Hz panel with a big “motion” number can’t.

High dynamic range needs brightness to work: bright highlights next to deep shadows. Plenty of budget TVs accept HDR formats such as HDR10, HLG or Dolby Vision but can’t get bright enough to show them properly, so HDR content may look dim or flat. The HDR badge tells you which formats a TV accepts, not how well it displays them.

While you’re at it, ignore “dynamic contrast ratio” claims in the millions. There’s no common method behind them, which makes them useless for comparison.

Brightness is everything for a projector, and it’s where specs get wild: cheap models advertise 9,000 or 15,000 “lumens” and deliver a fraction of that. The meaningful figure is ANSI lumens, or ISO lumens under the international standard ISO 21118, both measured with a defined method. “LED lumens,” “light source lumens” or plain “lumens” with no standard named can’t be compared.

A small Bluetooth speaker or soundbar claiming “1,000W peak power” isn’t doing what a 1,000-watt amplifier does. Peak and PMPO (peak music power output) figures describe brief bursts under flattering conditions, with no common standard behind them. Continuous power, sometimes labeled RMS, is more meaningful, but even that doesn’t tell you how loud or how good a speaker sounds, because driver efficiency and design matter just as much.

A “20,000mAh” power bank won’t charge a phone with a 5,000mAh battery four times. The mAh rating describes the internal cells at their low voltage, about 3.6 to 3.7 volts. Your phone charges at USB voltages, with conversion losses along the way, so the energy that reaches your device is often around 60 to 70% of what the rating suggests.

Watt-hours (Wh) are the better number because they account for voltage: 20,000mAh at 3.7 volts is about 74Wh. Wh is also what airlines care about. Under FAA rules, lithium batteries up to 100Wh can go in carry-on bags without airline approval, and spare power banks aren’t allowed in checked bags at all. Many airlines add stricter rules of their own, such as a limit on how many power banks you can bring or a ban on using them during the flight, so check with yours before you fly.

Routers are sold with names like “AX5400” or “BE19000.” That number adds up the maximum theoretical speeds of every radio band in the router. No single device gets it: your phone or laptop typically connects on one band at a time (newer Wi-Fi 7 devices can use more than one) and supports fewer data streams than the router does.

Real-world speeds are a fraction of the label and depend on distance, walls and, above all, your internet plan. If your plan is 500 Mbps, a router’s “19,000” won’t make it any faster.

USB-C is a connector shape, not a speed or a power level. A USB-C port might carry slow USB 2.0 data at 480 Mbps, or USB4 and Thunderbolt at 40 Gbps or more, and it might charge at a few watts or at up to 240W under the latest USB Power Delivery standard. Cables vary too: basic USB-C cables are generally rated for up to 60W, and 100W or 240W charging needs a cable built for higher current.

If charging is slow or a monitor won’t connect, the cable or the port may be the bottleneck.

More megapixels don’t automatically mean better photos. Sensor size, lens quality and image processing usually matter more, especially in low light. Many phones with 48-, 50- or 200-megapixel cameras combine groups of pixels into one, a technique called pixel binning, and save 12- or 12.5-megapixel photos by default. That’s good for low light, but it means the headline number mostly applies in bright conditions or special modes.

Robot and stick vacuums advertise suction in pascals: 5,000Pa, 8,000Pa, more every year. There’s no single industry-wide test behind those numbers, and suction alone doesn’t decide how well a vacuum cleans. Airflow, brush design, sealing and, for robots, navigation matter just as much. Some brands quote “air watts” instead, which are just as hard to compare across brands.

“Military-grade” usually refers to MIL-STD-810, a US Department of Defense standard that describes environmental test methods: drops, vibration, temperature extremes and more. There’s no official certification. Manufacturers choose which tests to run and under what conditions, and often run them themselves. It can mean a phone survived some drops. It doesn’t mean it’s indestructible.

IP ratings such as IP67 or IP68 are more standardized. They come from the international standard IEC 60529: the first digit rates protection against dust, the second against water. Still, the depth and duration of water testing can vary by product, testing uses fresh water, and protection can wear down over time. Many warranties exclude liquid damage anyway.