You are asking how far the square dance terminator is effective is it?50 meters, according to the query eBay number to know. Square dance artifacts and universal remote control is a principle, collected most of the market square dance speaker controller code, such as code match, you can control the speakers, and then through the infrared light to pass the instructions to the sound, you can end the square dance music, effective use of the distance up to 50 to 80 meters.