What is a card headphones?

Similar to the extension of the portable speaker: built-in decoding chip, support TF \ SD card, independent front-end playback; with multi-function keys to facilitate the operation. Looks like a "wireless" headphones, but it can be connected to digital devices such as computers, MP3s, and so on via an audio cable, using it as a normal wired headphones.

Card headphone features

1. Play TF card directly, music in SD card

2, a variety of charging functions (USB port plug in the computer to charge)

3, line IN external audio input (3.5 audio input)

4, with FM radio function (frequency of 76 to 108MHZ)

5, full support for hot swap, easy to use

6, compact and lightweight design, easy outdoor sports (foldable)

How to buy a card headset

First, process and parameters

The technical parameters of the plug-in headset are mainly the frequency range, output power, and signal-to-noise ratio.

1.The frequency range is generally 90Hz to 20KHz

2.The output power is a reference indicator of the card earphone, which is expressed in watts. This indicator does not explain the quality of the earphone. It merely indicates that the amplifier needed for the card speaker must be driven. The battery needs to have the required output power.

3.Signal-to-nosic ratio refers to the ratio of the output signal voltage of the amplifier to the noise voltage output at the same time. It is often expressed in decibels. The signal-to-noise ratio should not be less than 70 decibels, and the minimum value of the signal-to-noise ratio marked on the card earphone is 70 decibels ~90dB between.

Second listening quality

Mainly to listen to heavy bass,

Three recognized brands

Good card headphones have a well-made brand mark, if the trademark is not registered, there is no anti-counterfeit certification mark on the packaging, there is no warranty card inside the packaging, most of these three no products are suspected of counterfeiting, fake, not recommended to buy .