ITEM NAME:New 10pcs 12mm Rotary Encoder Push Button Switch Keyswitch Electronic Components Descriptio n Features : Brand new and high quality These are continuous rotary encoder switch With Built in push button switch (push to operate) Can input the data when used with in-car CD player Can control the volume, on/off and data selection through LED or LCD display Great for use with PIC or ATMEL microcontrollers I am sure it the right thing you need now.Don't hesitate,.These are continuous rotary encoder switch. 10 x Encoder switch. 10 x 12mm Dia 6mm Rotary Encoder Switch With Key Switch Electronic Components. Rotary Shaft Length: Approx. With Built in push button switch (push to operate).