You have two sets of wireless microphones, about 2000 yuan, some are cheap, but the effect is not good! A pair of 15 inch is used in large stadiums or outdoors. A pair of single 15 inches are used in small venues, one 400W and one 500W power amplifier. An effective 12 mixer will do. If you buy a miscellaneous brand, you can buy it for thousands, and if you buy a brand, it will cost more than 20 thousand.