Roland Electronic Drum Accessory (BT-1) Compact and reliable single-trigger pad Curved shape for mounting on a V-Pad or acoustic drum Quick and easy mounting through a drum tension rod; attachment parts for standard rod-type mounts included Internal design eliminates false triggering while playing surrounding drums and/or pads Use with a V-Drums module or SPD-series percussion pad to trigger sounds and control functions such as start/stop of backing songs and phrase loops, effects on/off, kit selection, tap tempo, and more