Pressing the shutter button at the remote shutter release button halfway, the camera focuses as usual. Pressing triggers logically. In bulb mode, the shutter stays open while you hold the button pressed. With long exposures you can also find the button to hold it must not permanently.
The build quality is more than adequate, the button has a pleasant pressure point, the cable is long enough and also makes a strong impression. The remote release comes securely packaged in a small cardboard box. A purchase that has paid off for me.