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Bluetooth codecs such as AAC, aptX, and LDAC determine the quality and efficiency of audio transmission over Bluetooth connections. The better the codec, the higher the potential audio quality.

Refers to the headphone's ability to block out external noise actively (with technology) or passively (with physical insulation). Active noise cancellation enhances the listening experience by reducing unwanted background noise.

A term used to describe the perceived three-dimensional space and depth of the stereo audio image provided by the headphones, contributing to a more immersive listening experience.

The range of frequencies that headphones can reproduce, typically measured in Hz. It's crucial for ensuring balanced reproduction of bass, mids, and highs.

Defined in decibels of sound pressure level per milliwatt (dB SPL/mW), it indicates how loud headphones can get with a given power input. Higher sensitivity means louder volume at a given power.

Measured in ohms (Ω), impedance indicates the headphones' resistance to electrical signal. Lower impedance is easier to power, but higher impedance may yield better quality with proper amplification.

THD is the measure of distortion produced by headphones. Lower THD values typically result in cleaner, more accurate audio reproduction.

Measured in millimeters, the driver size can influence the sound quality, with larger drivers typically able to produce better bass response.

Indicated by IP rating (Ingress Protection), it signifies the headphone's degree of protection against sweat and water, which is important for use during exercise or in wet conditions.