Purchase sound (square dance, outdoor use, not too big, 5O people). Buy what you need to function than the effect is good

Main features: 1, waterproof to be good; 2, battery life should be long; 3, with TF card, U disk and other commonly used interfaces; 4, with remote control; 5, with Bluetooth, you can play music through cell phones, etc.; 6, microphone interface, instrument interface; 7, high and low tuning function; 8, others such as voice prompts, intelligent backing vocals