Handheld Wireless Karaoke Microphone (Not included AA battery) This wireless microphone systems ideal for the family home KTV church parties Karaoke singing conferences and etc. Cardioid Polar Pattern： Pick up effective sound to make the sound more focused and clearer. 2022 latest upgrade screen: The blue LED digital screen clearly show the power signal and frequency which is more fashionable and upscale. 5 levels of sound adjustable: 08-12 The sound from small to large can be adjusted cyclically. Dual channel: There are two different channel frequencies of two microphones will not string frequency. Support 15 sets using at same time.