The button switch operation type of this product is instantaneous. Press and hold the button to turn it on, and release the button to turn it off. Each 12V momentary switch comes with an 11.8-inch cable on one side for easy concealed installation and takes up no space The back of the momentary push button switch is equipped with strong double-sided tape, which can be fixed in any position as needed, easy to DIY installation Application scope: The product can be used in trigger response switches in automobiles, ships, industrial equipment, medical-equipment, homes, etc. Colour:Black Material:Plastic Size:Line length:30cm Package Contents: 4 x Momentary push button switches Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.