UXCELL 20Pcs DIP Switches BCD Code Thumb wheel Switch KM2 0-9 Digital Black Cream 30x18x8mm for Design of Accounting Systems Specification : Product Name: DIP Switch Type: BCD Code Model: 8421 code switch Digital : 0-9 Main Material: Plastic, Metal Size: 30 x 18 x 8 mm ( LxWxT) Package Content: 20 x DIP Switches Description: 1.Only one unit to choose among 0 to 9 totally 10 digits. 2.Two change switch to get increasing sequence or reduce sequence. 3.please pay attention, pack total of 20 pieces they need you to assembled for used. it is easy to assembled and DIY 4. This coding technique is most commonly used in the design of accounting systems. It uses BCD codes to preserve the accuracy of the values and eliminate the time it takes for the computer to perform floating-point operations. In addition, for other high precision calculations required , BCD coding is also very common. _x000D_