Description: brand new and high quality Optional type:MG90s set, SG90 set(as your choose) Material:Acrylic Color:Black Difference between MG90S and SG90: MG90S: Metal gear,steering engine,development board (Original version) SG90: Plastic gear, steering engine development board (China version) DIY value Learning potentiometer control servo Learning serial port control servo Understand the control principle of automated robotic arms This is a classic 4-DOF machine that has been around for a long for time and is inspired by industrial robotic arms. This is an economical, powerful and easy to use robotic learning kit. The kit is suitable for use in the maker space, college students, and middle school students. The control board adopts the international version of the original UNR 3, and there are many learning materials on the network for easy learning and use. About control methods The control method is also very simple, with four knobs to control the movement of each potentiometer, anyone can operate. After connecting the computer with USB, you can send commands through the serial port to control the movement of the servo. It is also for other computer control software, and also supports writing programs to perform fixed and repeated actions. About assembling This product expansion board is shipped as a spare part and needs to be soldered by yourself. The assembly of acrylic parts requires a certain amount of patience, we provide a complete graphic tutorial for everyone as a guide. The original knob control program has been burned. Quantity: 1 set Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you SG90 Package includes: 1 set x Acrylic cutting parts + fixing screws 1 xdevelopment board (China version) 1 x Potentiometer control board (need to be soldered by yourself) 1 x 5V2A power adapter 4 x SG90 servos(other accessories demo in the picture is not included.) or MG90S: set Package includes: 1 set x Acrylic cutting parts + fixing screws 1 x development board (Original version) 1 x Potentiometer control board (need to be soldered by yourself) 1 x 5V2A power adapter 4 x MG90S servos(other accessories demo in the picture is not included.)