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Power delivery range: Main voltage dual DC 35-55V, recommended for twin DC 45V; Horn defense strength delivery unmarried AC 12-17V, commended for AC 12V PCB board size: 167 * 83MM 1 pair of empty forums 1: The R1 at the left board and the R1 on the correct board are either 22K, no longer 22R 2: On board υ There are no 3 holes drilled at role 69, Soldering method: If the solder pad has related wires, solder it If the solder pad does not have connected wires, position the toes of D669 on the back for soldering (If there is not any wire at the front, the again will definitely be soldered)