THIS IS THE MACBOOK AIR 13 RETINA 2018 MODEL WITH THE INTEL I5 PROC AT A SPEED OF 1.6GHZ ON A 250GB SSD RUNNING MAC OS MOJAVE.  AT PURCHASE, UNIT WAS UPGRADED TO A FAST 16GB OF HIGH QUALITY RAM MEMORY.  UNIT WAS NOT USED MUCH.  BATTERY IS STILL QUITE STRONG AT A LOW USAGE CYCLE OF 260.  MACBOOK BATTERIES WILL ON AVERAGE LAST UP UNTIL 1000 CYCLES OR MORE.  THE SCREEN HAS BLACK LINES AT THE RIGHT SIDE WHICH MEANS THE SCREEN IS ABOUT TO FAIL.  ANY APPLE CERTIFIED REPAIR CENTER CAN REPLACE IT FOR A REASONABLE COST.  POWER ADAPTER IS INCLUDED.