The WJ-CASE accessory serves as both a carrying case with shoulder strap (not shown) and a protective front cover. Simply slide the WaveJet in to the case and snap on the front cover for transport, when it is time to use the WaveJet remove the front cover and operate the WaveJet while it is still in the case. To make sure you do not lose the front cover turn it around and snap it on to the case from behind.