Safety switch on the hedge trimmer

My hedge trimmer has a system which means that both hands have to be firmly gripping the handle before it will cut. This is to stop me cutting my hand. I was surprised by how mechanical the system is. I had expected it to be based more on electrical contacts. My left hand pulls up on the switch shown in the bottom picture. The switch is actually a lever. The way it is pivoted suggests a "distance multiplier" - the distance moved by the tip is more than my hand moves. The top two pictures show the right hand lever. This just moves the handle closer to the red electrical switch. Both together means that the white plastic then depresses the switch and the hedge trimmer works.