The Jabra Speak 510 is an external microphone that is used in tandem with apps on your device, such as your computer/phone, to record audio. Such apps that can be used are Voice Memos (for Apple) and Microsoft OneNote (for Android). The speaker helps record the audio and increase the quality while the apps store the recordings so they can be reviewed later. You can transfer the recordings to other devices as well.
This Youtube video explains how to use a Jabra Speak 510.
This is a User Guide on how to use Voice Memos by Apple Support.
This is a User Guide on how to use Microsoft OneNote by Microsoft Support.