| Storage unit: GB vs. TB | 1 terabyte (TB) = 1,000 gigabytes (GB) |
| Typical phone battery capacity | 3,000–5,000 mAh for most modern smartphones |
| IP68 water resistance | Submersion up to 1.5–6 m, depending on manufacturer spec |
| Standard display refresh rate | 60 Hz; premium displays often reach 90–144 Hz |
| NFC range | Typically under 4 centimetres |
Why Device Specs Feel Like a Foreign Language
Pick up any gadget box — a phone, a laptop, a pair of wireless earbuds — and you'll face a wall of abbreviations, numbers, and trademarked terms that manufacturers rarely bother to explain. GHz, mAh, IP68, nits, NFC, HDR — they sound technical because they are, but none of them are beyond understanding. Each one answers a practical question: How fast? How long? How waterproof? How bright?
This glossary gives you plain-language definitions for the terms you'll encounter most often, grouped by what they actually describe. Whether you're reading a settings menu, a spec sheet, or an instruction manual, use this as your quick-reference guide. For a broader primer on how devices connect to the wider digital world, see our plain-English guide to the internet.
| Storage unit: GB vs. TB | 1 terabyte (TB) = 1,000 gigabytes (GB) |
| Typical phone battery capacity | 3,000–5,000 mAh for most modern smartphones |
| IP68 water resistance | Submersion up to 1.5–6 m, depending on manufacturer spec |
| Standard display refresh rate | 60 Hz; premium displays often reach 90–144 Hz |
| NFC range | Typically under 4 centimetres |
Processing Power and Memory
These specs describe how fast a device thinks and how much it can hold in mind at once.
GHz (Gigahertz)
A measure of processor clock speed — one GHz equals one billion cycles per second. It gives a rough sense of raw processing pace, though real-world performance also depends on core count, chip architecture, and software efficiency.
RAM
Random-access memory. The short-term working space your device uses to run active apps and processes. More RAM allows more tasks to run simultaneously without slowdown.
mAh
Milliampere-hours — a unit measuring how much energy a battery can store. A higher mAh rating indicates a larger capacity, though battery life also depends on how much power the device consumes.
IP Rating
Ingress Protection rating. A two-digit code indicating how well a device resists dust and water. The first digit covers dust (scale 0–6); the second covers liquid (scale 0–8 or 9K).
HDR
High Dynamic Range. A display standard that simultaneously renders very bright highlights and very dark shadows, producing images closer to what the human eye perceives in real environments.
NFC
Near Field Communication. A short-range wireless standard (effective within a few centimetres) used for tap-to-pay transactions, access badges, and quick device pairing.
Nits
A unit of screen brightness. One nit equals one candela per square metre. Higher nit counts make displays readable in brighter environments.
Hz (Refresh Rate)
Hertz — the number of times per second a display redraws its image. Higher refresh rates (90 Hz, 120 Hz) produce smoother motion during scrolling, gaming, and video playback.
When a spec sheet says a chip runs at 3.2 GHz, that's the processor's clock speed — how many billions of operations it can attempt per second. More GHz isn't automatically better; modern chips also vary in the number of cores (independent processing units) and how efficiently they handle different task types. A device with fewer high-efficiency cores can outperform one with more slower cores in real-world use.
RAM (random-access memory) holds the apps and data your device is actively working with. More RAM means more apps can stay open simultaneously without slowing the system down. Storage (often listed in GB or TB) is where everything lives permanently — your photos, apps, and files — until you delete them.
Battery, Charging, and Power
Battery specs are among the most misunderstood on any device label.
mAh (milliampere-hours) measures the total electrical charge a battery can store. A higher mAh number means the battery holds more energy — but actual battery life also depends on how power-hungry the screen, processor, and wireless radios are. Two phones with identical mAh ratings can have very different real-world run times.
Wattage (W) on a charger describes how quickly it can push power into the battery. A 65W charger refills a device much faster than an 18W one, provided the device supports that charging speed. PD (Power Delivery) and Fast Charge are protocol names for standardised fast-charging systems — not all cables and adapters support them equally. For more on why cable and port types differ, see our guide to USB cables and ports.
Display, Connectivity, and Protection Ratings
These are the specs most visible in everyday use.
Nits measure screen brightness. Outdoor readability typically requires 600 nits or more; a high-end display might reach 1,000–2,000 nits for HDR content. HDR (High Dynamic Range) means the display can show a wider range of brightness levels and colours simultaneously, making bright highlights and dark shadows appear more realistic. For a deeper look at how screen technology affects what you see, our OLED vs. LED explainer covers the key differences.
Hz (refresh rate) indicates how many times per second the screen redraws its image. A 60 Hz display refreshes 60 times per second; 120 Hz looks noticeably smoother for scrolling and video. NFC (Near Field Communication) is the short-range wireless technology that enables tap-to-pay and quick device pairing within a few centimetres.
IP ratings (e.g. IP67, IP68) describe resistance to dust and water. The first digit rates dust protection (6 = fully dust-tight); the second rates water protection (7 = submersion up to 1 metre for 30 minutes; 8 = deeper or longer, per manufacturer spec). These ratings are tested under controlled conditions and don't guarantee performance after drops or general wear.
Lab Ratings vs. Real-World Conditions
IP water-resistance ratings are measured in controlled laboratory conditions using fresh water at specific pressures and durations. Saltwater, chlorinated water, or drops onto hard surfaces can compromise seals over time. Manufacturer warranties typically don't cover water damage even on rated devices, so treat the rating as a useful guideline rather than an unconditional guarantee.