| Common refresh rates | 60 Hz, 90 Hz, 120 Hz, 144 Hz |
| Standard display brightness unit | Nits (cd/m²) |
| USB-C PD maximum wattage (spec ceiling) | Up to 240 W (USB PD 3.1) (USB Implementers Forum specification) |
| Wi-Fi 6 standard designation | IEEE 802.11ax (Wi-Fi Alliance) |
| Audio latency threshold for noticeable lip-sync drift | ~40–50 ms (General audiovisual engineering reference) |
Why Electronics Specs Can Feel Like a Foreign Language
Walk into any electronics department or scroll through an online product listing and you'll encounter a dense wall of numbers and acronyms: HDR10+, USB-C PD, aptX Lossless, 120 Hz. Manufacturers use these terms to differentiate their products, but they rarely pause to explain what the specs actually mean for your day-to-day experience.
This reference guide cuts through that noise. Whether you're setting up a new TV, pairing wireless headphones, or troubleshooting a sluggish tablet, the definitions below give you the vocabulary to understand what your device is doing — and why it matters.
For networking-specific terms you'll see in router menus and speed tests, our plain-English glossary of latency, ping, and packet loss covers that territory in depth. And if software jargon is tripping you up, see our software terms glossary for definitions of things like cache, API, and firmware.
| Common refresh rates | 60 Hz, 90 Hz, 120 Hz, 144 Hz |
| Standard display brightness unit | Nits (cd/m²) |
| USB-C PD maximum wattage (spec ceiling) | Up to 240 W (USB PD 3.1) (USB Implementers Forum specification) |
| Wi-Fi 6 standard designation | IEEE 802.11ax (Wi-Fi Alliance) |
| Audio latency threshold for noticeable lip-sync drift | ~40–50 ms (General audiovisual engineering reference) |
Display Terms
Your screen's performance is described by several distinct specs — each measuring a different dimension of visual quality.
Refresh Rate
The number of times per second a display redraws its image, measured in hertz (Hz). A higher refresh rate — 90 Hz, 120 Hz, or 144 Hz — produces smoother motion, which is especially noticeable during scrolling, gaming, and fast-moving video.
HDR (High Dynamic Range)
A display standard that expands the range of brightness levels and colors a screen can show simultaneously. HDR-capable screens can render brighter highlights and deeper shadows compared to standard displays, making images appear more lifelike.
Nits
A unit of brightness used to measure how much light a screen emits. Higher nit values indicate a brighter display, which is important for visibility in well-lit rooms or outdoors. A typical indoor TV might peak at 300–500 nits; high-end HDR displays can exceed 1,000 nits.
Response Time
The time a display pixel takes to change from one color to another, measured in milliseconds (ms). Lower response times reduce motion blur and ghosting, which is particularly relevant for gaming monitors and fast-action video.
Codec
Short for coder-decoder. A codec is software or hardware that compresses and decompresses digital audio or video data. The codec used affects file size, streaming quality, and compatibility across devices.
USB-C Power Delivery (PD)
A fast-charging specification for USB-C connections that allows devices to negotiate and receive higher wattages than standard USB allows. A single PD-enabled cable and charger can power laptops, tablets, and phones.
NVMe SSD
Non-Volatile Memory Express Solid-State Drive — a type of fast storage that communicates directly with a device's processor over a high-speed interface. NVMe SSDs are significantly faster than older storage types like eMMC or traditional spinning hard drives.
Bluetooth Profile
A standardized set of rules that defines how Bluetooth devices communicate for a specific purpose. For example, A2DP (Advanced Audio Distribution Profile) governs stereo audio streaming, while HFP (Hands-Free Profile) handles calls. Both the source and receiving device must support the same profile.
Refresh rate and resolution are frequently confused. Resolution describes pixel count (sharpness), while refresh rate describes how many times per second the image updates (smoothness). A 4K screen at 60 Hz looks sharper than HD, but a 1080p screen at 144 Hz will appear noticeably smoother during motion. For a deeper look at resolution labels, see Screen Resolution Numbers, Decoded.
HDR Labels Are Not All Equivalent
HDR10, HDR10+, Dolby Vision, and HLG are distinct HDR formats with different technical implementations and compatibility requirements. A device labeled 'HDR-compatible' may only support the baseline HDR10 standard. Check both your display and your streaming service or disc player to confirm which formats are mutually supported.
Audio, Connectivity, and Power Terms
Beyond displays, several other spec categories appear regularly on packaging and in settings menus.
Audio
A codec (short for coder-decoder) compresses and decompresses audio data. Wireless headphones and speakers rely on Bluetooth codecs — such as SBC, AAC, and aptX — to transmit sound. Higher-quality codecs can deliver more audio data per second, which can reduce audible compression artifacts, though the actual improvement depends on both the source device and the headphones.
Latency in audio refers to the delay between a sound being created and your ears hearing it. In wireless headphones, noticeable latency causes a mismatch between on-screen video and audio — sometimes called lip-sync drift.
Connectivity
USB-C Power Delivery (PD) is a charging standard that allows a single USB-C cable to carry significantly more power than standard USB, enabling fast charging for laptops, tablets, and phones. The wattage a device can accept and the wattage a charger provides must be compatible — higher wattage from the charger won't force more power into the device than it's rated to handle.
Wi-Fi 6 (802.11ax) is a wireless networking standard designed to handle many devices simultaneously more efficiently than its predecessors. The benefit is most noticeable in homes with many connected devices, not just in raw speed gains for a single device.
Storage
Consumer devices commonly ship with either eMMC (embedded MultiMediaCard) or NVMe SSD storage. eMMC is slower and typically found in budget tablets and entry-level laptops; NVMe SSDs are substantially faster and appear in mid-range to premium devices. The difference is meaningful for app launch times, file transfers, and overall responsiveness.
If you're evaluating a secondhand device, storage type and health are worth confirming. Our refurbished device checklist walks through what to verify before purchasing.
120 Hz
Refresh rate now common on mid-range phones
A rate that was exclusive to premium flagships through the late 2010s has become a standard feature on many mid-tier smartphones as of the mid-2020s.
7×
Speed difference: NVMe SSD vs. eMMC storage
Sequential read speeds on NVMe SSDs commonly exceed 3,000 MB/s, compared to roughly 300–400 MB/s for typical eMMC, according to published manufacturer specifications.