The unit is incorrectly designed. The sponge rubber fitted on the bottom plastic plate is on the wrong side> When en we wish to place he unit on driver side or passenger side seat and switch the bottom plate, then the plastic side always rubs against the seat cushion, instead of the sponge rubber fitted on the unit bottom vertical plate. Hence when the seat is moved back or forth the plastic side of the unit bottom plate rubs the seat cushion fabric, which will damage the seat fabric. The idea and description of product in website appears good, but the product design is faulty and the sponge should have been fitted on the opposite side of the bottom removable/switchable plastic plate to suit driver seat or passenger seat.
Also the end pin of USB port wire had a 12 volt adaptor, but the end pin of this 12 Volt adaptor was loose with very little spring tension, which over a period of time may lose contact or come of, hence quality was not good. hence returned product for refund.