As can be noticed during the picture, the LED image entire body includes a diode symbol with two arrows. The 2 arrows denote that light is emitted from this unit. An LED has an anode and cathode terminal. In the impression, the anode is about the still left and cathode https://www.uk-exhibitionstands.co.uk/product/air-inflatable-backlit-circular-tower-2m-2280mm-h/