JBL Tune 125BT Coral

Over-Ear (cover the ear completely), on-ear (pressed against the ear), in-ear (inserted into the ear canal) or earbuds (inserted into the auricle, but not inserted into the ear canal).

Technology of increasing the standard USB voltage and current to speed up battery charging

The upper limit of the frequencies reproduced by the device. The human ear hears the standard frequency range: 20 Hz – 20000 Hz.

Bluetooth is a short-range wireless technology that allows you to connect headphones or portable speakers, a stereo system or a soundbar to your smartphone or laptop. For a certain version to work, both devices must support it. The versions differ in data transfer speed, power consumption, securing data transfer, anti-interference ability and range of connection.

Voice Assistant is a mobile software agent that can perform tasks based on the user voice commands

To take advantage of a particular codec it must be supported by both devices

No higher than 32 Ohms for smartphone headphones. When using a good player or amplifier, it can be up to 100 Ohms. For stationary models you should coordinate the impedance with the amplifier power

More sensitive headphones will play louder than headphones with less sensitivity (with the same signal level and resistance)

Most of the headphones are dynamic but there are electrostatic, isodynamic, etc.

The number of drivers in each headphone. However, quantity does not equal quality. Driver coordination, their configuration, correct crossover, sound bores affects the sound

The material of earpads affects both your comfort and the sound. It can be leather, eco-leather, velour, fabric/microfiber and foam rubber.

Wired, wireless with neckband/wire, True Wireless.