2 Set Electronic Accessories: 5 x Potentiometers & 1 set x RS232 Serial TO TTL Converter Module Shaft Diameter: 6mm / 0.2inch Shaft Length: 13mm / 0.5inch Mounting Thread Diameter: 6.5mm / 0.3inch; Base Height: 10.7mm / 0.4inch;Base Diameter: 17mm / 0.7inch; Colour:as shown Material:Metal +Electronic Parts RS232 Serial TO TTL Converter Module: This is small RS232 to TTL level serial converter module, suitable for any 3.3v or 5v target devices. Built-in SP3232EEN chip Fully compatible with existing legacy COM port software Easy to use Output signals: VDD, TXD, RXD, CTS, RTS, GND Power input: 3.3V or 5V Compact design. Potentiometers: Knurled Shaft; Product Name: Potentiometer Resistance Value: 50K ohm Adjustment Type: Top Adjustment Type: Linear Dual(Type B) 50K ohm, 6 Terminals, Linear Dual(Type B), Suits Most Standard Knobs. Top adjustment type and knutled shaft for easy operate in daily use time. Main used to control electrical devices such as volume controls on audio equipment. With split shaft for push-on knob. Package Contents: 5 x Potentiometers 1 x RS232 Serial TO TTL Converter Module 4 x Jumper Wire Note: Random color, don't accept the specified color.