|Audio frequency scope||2.402GHZ~2.480GHZ ISM Band|
|External charging voltage||DC 4.8-5.5V|
|Charging power source||PC USB 5V|
Headphones, as the name suggests, are worn on the head, not inserted into the ear canal, and are different from in-ear earphones. It is composed of two parts, a signal transmitter and a headset (usually a moving coil) with a signal receiving and amplifying device.
The transmitter is connected to the signal source, and you can also connect a preamp or headphone amplifier in front of the transmitter to improve the sound quality and adjust the tone.
1: Good sound field and good comfort.
2: Do not enter the ear, avoid scratching the ear canal
3: Compared with in-ear earplugs, it can listen for a longer time
Wireless headsets generally refer to headset systems that transmit signals by infrared rays, and cordless headsets refer to headset systems that use radio waves to transmit signals. The working frequency of infrared earphones ranges from a few KHz to a few MHz, and the effective distance is about 10 meters. The earphones must be within the visual range; the working frequencies of the radio earphones are VHF 130MHz-200 MHz, UHF 450 MHz -900MHz, and most cordless earphones work on UHF , The transmission range is up to 100 meters, and obstacles can be bypassed. Two or more wireless/cordless earphones may interfere with each other, so when choosing them, it is best to choose a variety with multiple operating frequencies. For cordless earphones, the possibility of interference when working on UHF is less than that on VHF. Both of these headphones have background noise, and the higher-end models have adopted noise reduction technology. Also note that the battery life of the wireless/cordless headset should generally not be higher than 8 hours.