Each capsule measures 2.3 m ( 7.5 ft ) × 3.8 m ( 12 ft ) × 2.1 m ( 6.9 ft ) and functions as a small living or office space .
They are 2.3 m ( 7.5 ft ) × 3.8 m ( 12 ft ) × 2.1 m ( 6.9 ft ) and have one round window .