What should you do first to test the operation of the Loudhailer?

To test the operation of the Loudhailer, the first action should be to squeeze the handle. This action is typically designed to initiate the device and enable its primary function, allowing you to check if it is working properly. Squeezing the handle activates the Loudhailer, which is crucial for confirming its operational status.

Other actions, such as pressing a button or flicking a switch, may be secondary steps or specific functions that could depend on the initial activation via the handle. Turning up the volume is also contingent upon the device being powered on and operational. Hence, squeezing the handle is the most direct and essential first step in testing the Loudhailer.