SMAKN Mini USB 24 Channel Servo Motor Driver Controller Module for Arduino
About this product
*32-bit CPU.
*Power of servo and control board are separate.
*Chip Power Supply: 6.5V ~ 12V or 4.5V ~ 5.5V ( one is for USB ).
*Servo Power Supply: Generally DC 5V (base on the servo you use).
*Channel: 24 ( servo speed adjustable).