The boya by-tx8 wireless transmitter for by-wm8 pro is a wireless transmitter that you can use with the by-wm8 pro-k1 wireless microphone set. the by-tx8 is an extension of this set and is ideal for interviews, eng/efp, movie productions and more. this transmitter (equipped with lcd display) comes standard with an omnidirectional lavalier microphone. one of the features of the by-tx8 is its low distortion rate, which results in higher sound quality. in addition, the transmitter is compact and lightweight. the transmitter uses two aa batteries (not included), allowing you to use it for up to 6 hours. the transmitter has a range of 100 meters from the receiver, if there are no obstacles in between. the wireless frequencies are 556.71 mhz-575.98 mhz and 576.39 mhz-595.66mhz. Usage boya by-tx8 for by-wm8 pro The interviewee wears the transmitter, which can be attached to the belt using the clip provided. you can then choose between groups a and b, and choose from 48 different channels. you can also determine the sound level yourself and choose between line- and mic-level. at the bottom there is a mute button. Transmitter specifications: - rf output level: 10 mw - audio input connector: 3.5mm jack plug - reference audio input level: -60dbv - input frequency range: 20hz-20khz - distortion: 0.5% or less - power supply: 2x aa battery (not included) - max. consecutive service life: 6 hours - dimensions (h x w x l): 208x67x29 mm - weight (without batteries): 80 grams