Our over-ear headphones featured with a frequency response of 85-108MHz, more than 50dB SNR(signal to noise rate) and less than 2% distortion, offering you a crystal clear sound without compromise. Providing you five functions (Wireless monitors, receiving clear sound when TV set mute function, search and receive FM radio channel, chat with your pen pal friends through inbuilt microphone, freely shift between wireless and 3.5mm wired earphone ). Up to 30m/98.4 feet theoretically transmission dis