Left image: The image shows a hand holding a mobile phone with finger tips. The text on the screen of the mobile phone says "ULTRA SLIM".  The mobile phone is indeed very slim.
Right image: The image shows a slim mobile phone connected to a thick,big and heavy power bank for charging the mobile phone.
The image is satirical because even though the mobile phone has been developed to be very slim, it requires frequent recharging which makes the mobile phone useless without a big, heavy and thick power bank.