This item contains normal type and typing type. Typing type is that particle only emits when you're typing.
Type "/11change" and a dialog menu will drop down allowing you to choose 6 particle textures or turn the particles off.
You can also use voice commands on channel 11, as follows:
/11 on_off /11 star1 /11 star2 /11 heart /11 yingyang /11 snow /11 hexagon