The amplifier loop body interface adopts a new fixed design, and different loop wires can be used to connect the amplifier unit. It fits straight-through cords, flat aluminum strip loops, feeder lines with terminal or with banana head and the like. It is convenient to erect in different environments. The amplifier unit is designed with professional fasteners, which can be fixed to a support rod with a diameter of 20mm/0.8. The power supply unit has the same specifications as other LNR products.12V power supply and 2.1mm DC interface (internal positive and external negative). Package Included: - 1 x Amplifier unit - 1 x Power supply unit Note: - Feeder line, power adapter and aluminum loop are not included. Thank you for your understanding! Usually it cost about 35USD-50USD. If you receive defective item, please kindly notify us within 14 days.