Umount Android device

Umount Android device

I've connected my Android tablet to Ubuntu in order to write some code
using Intellij. Everything works ok, but now I don't know how to
disconnect my tablet. My /media/ and /mnt/ directories are empty and lsusb
display this:
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 003: ID 046d:c062 Logitech, Inc.
Bus 004 Device 002: ID 0d62:001c Darfon Electronics Corp. Benq X120
Internet Keyboard Pro
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 007: ID 18d1:0003 <<<---- THE TABLET
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
So, how can I safely disconnect my tablet?