The button sensor hosts four buttons. When a button is pressed, all buttons will briefly light up (0.5 s) and the pressed button will keep glowing for about 1.2 seconds.

When either button is pressed, all other buttons become unresponsive until the current press has been handled.

The button-sensor works completely interrupt-based and is always in sleep. Sleep current is below 1 µA and typically around 350 nA. On a button press, the device becomes active for 1.7 seconds with an average current consumption of 7.3 mA.

See description file here.