As an adapter, easily to convert input to output and with IN/OUT switch, no need to plug in and out cables repeatedly to avoid wearing the contact point of the sockets.
Delay adjustment, to adjust the sensitivity of that is the speed of beating to adapt to different music styles.
Environment noise filtering, can filter redundant noise and only retain the music from players, the will swing more accurately.
As a VU meter, with LINE and microphone inputs, can be well with most devices such as phone, computer, CD players, speakers very suitable for home/office/studio to dynamically decorate your auditory feast.
adjustment, to adjust the of input that is the swing range of to get differnt display effects.