Brilliant little tool, very easy to use!
This item arrived in a resealable plastic packet (clear on the front, white on the back), inside a strong, protective, plain cardboard box. The packet contained the device itself, a new 9v battery, and a decent little instruction leaflet.
I think it’s awesome that a battery is included, so you can just pop it in and go – so rare these days! Using the device is as simple as sliding off the back cover, plugging in the battery, closing the cover, pressing the power button, and putting the sponge protected microphone in your desired place for testing.