1,We have professional factory to product this dc power supply for 10 years . 2,You would customized logo that what you want ,course we support customized logo that if the quantities over 50 pcs ,the logo fees is free . 3,If you need a big quantities ,I will give a best price and best discount to you . 4,Whenever you have any problems ,please connect me , I would reply to you as soon as possible. 5,We aim to provide first-class services and products.