Fangrui Product Details Ad584 Instructions For Use: Input The Dc 12v-24v Voltage On The Left Side, You Can Connect It From The Terminal, Or You Can Directly Use The Router Power Supply To Insert The Dc Socket, And Use The Multimeter Test Lead To Insert It Directly On The Right Side. If You Cant Insert It, Adjust The Screw. Just Plug The Shorting Cap Into The Corresponding Jumper. Description: It Is A Ad584kh Reference Voltage Board. It Can Be Used To Calibrate The Multimeter. : 1)it Uses The Copper Terminal, And The Multimeter Pen Can Be Inserted Directly. 2)it Can Select The Output Voltage Value Through The Short-circuit Cap. 3)the Input Power Can Use The Power Of The Router And Plug It Directly Into The Dc Socket. Parameter: 1)product Name: Ad584jh Reference Voltage Board 2)input Voltage: Dc 12v-24v 3)output Voltage: Dc 2.5v/5v/7.5v/10v 4)work Temperature: -25855)work Humidity: ~rh Notw: Depending On The Batch, The Color Of The Jump Cap On The Board May Be Random, Cannot Be Chosen The Specific Color.and