Wild blackboard creed 2 High-precision electric pot adder. 2V to 2V medium selection signal addition to import signal, export and export of normal traffic. Second Link Expressway, Second Link Expressway, First Link Expressway, Second Link Expressway, Second Link Expressway. Import signal 號 樣 從 Thru export.
It is easy and highly accurate, but it is very useful for the frequency of renewal and renewal of the FM period.