Porodo Soundtec Duo Mic Aluminum Wireless Microphone Rechargeable - Black has been innovatively designed for the best vibrancy in sound coupled with seamless connectivity. It comes with two rechargeable 800mAh batteries, which can provide audio output of up to 4.5 hours on a single charge with a 25-meter radius for wireless and freedom movement. Engineered with DSP regulation technology and ultra-high frequency (2.3GHz/2.4GHz/2.5GHz) signal transmission, it guarantees audio transmission of really high quality. It also features plug & play in a 6.3mm mono plug, working well with karaoke machines and audio systems. Its digital display, Type-C charging, and unidirectional polar pattern make it an excellent choice for karaoke, performance, and professional applications.