You have 3 ways to check the information:
Method 1: Check the IMEI/Serial information from the IMEI/Serial label which is stuck to the battery cover.
Method 2: Enter *#06# in the dialing keypad (only for 9080G_X1).
Note: If a SIM card is not inserted in your tablet, the IMEI information may not appear on the screen. Please insert a SIM card and then check the IMEI information again by typing *#06#.
Method 3: Go to the main menu -> 「Settings」 -> 「System」 -> 「About tablet」 -> 「Status」 -> 「Device IMEI/Serial number」.