Dear customer: Thank you for choosing my store for shopping. The following are the matters needing attention for shopping:A. Economic transportation: detailed tracking information will not be included. Most of the packages will cause delayed delivery within the expected delivery time, so you need to be patientB. Each product link: There will be different option variants. If you do nt know how to select the product you want, please contact me, I will be honored to solve this problem for you.C. When you receive the package, there is product damage / product problem / error product and shipping problem, please contact me in time, I will solve it for you!D. If you are a wholesaler / distributor, a large number of orders and quantities, to provide you with factory prices, and hope to be honored to reach a partner with you!GOOGZON store: I wish you a happy life! Material: PCB board and electronic componentColor: as the pic showsInput voltage: 5-40VOutput voltage: 1.2-35V (continuously adjustable)Output Current: 9A (power tube temperature exceeds 65C please add cooling fan)Constant current range:0.2-9A ( adjustable )Output Power: Maximum power is about 300W (power tube temperature exceeds 65C please add cooling fan)Size: Approx. 2.55*1.88*0.94inch / 6.5*4.8*2.4cm(Length*width*thickness)