- & : YMOO MK04J2 microphone and speaker set has a built-in 1800mAh battery.allowing you to use it for 12-15H. It is designed with four eye-catching LED power indicators on the side to remind the remaining power in real time. / - : YMOO MK04J2 can work up to 165Ft/50m in the case of no obstacles. In the classroom, you don't need to wear a loudspeaker, you just put it on the podium, and then you can teach students with a wireless microphone, reducing the pressure on your wearing. & : Its amplifier adopts CA6956C Crackles Sound Suppression Chip, You don't have to worry about crackling when you bend over. In terms of delay, it can achieve <1ms, which is almost comparable to that of wired microphones. You don’t have to worry about the trouble caused by delay, and it truly achieves no delay. : YMOO MK04J2 has a wireless microphone with UHF frequency band, which is not only farther in transmission distance, but also more anti-interference. It comes with an additional pair of wired mics, so when your wireless mic runs out of power, you can use the wired mic to continue your unfinished work. : Its speakers are made of neodymium iron boron and can output 10W of powerful, clear, crisp, noise-free and distortion-free sound covering approximately 10,000 square feet (1,000 square meters). It has stable performance, can perfectly amplify the sound, and can save your throat.