1Support for 4-axis linkage, you can connect four stepper motor drives or servo drives. 2Maximum step-pulse frequency is 100KHz, which is suitable for the servo or stepping motor. 3Support automatic probe tool. 4Support for limit switch. 5Support for connecting electronic hand wheel. Features:Support for 4-axis linkage, you can connect four stepper motor drives or servo drives. Maximum step-pulse frequency is 100KHz, which is suitable for the servo or stepping motor. Support automatic probe tool. Support emergency input. Support for limit switch. Support for connecting electronic hand wheel. Need use external 24V DC power supply to isolate USB and external port, and to make the system more stable. Have 0-10V output port, you can use MACH3 software to control the spindle motor speed. 4 general-purpose inputs, you can connect the limit switch, estop switch, probe switch, back to zero and other device. 4 general-purpose isolated relay drive output interface, can drive four relays for controlling the spindle starts, forward rotating and reverse rotating, pumps and other device. Status LED, indicate connection status on the board.Specification:Interface board size: 9*6.3*2cm/3.5*2.5*0.8in Jog handler size: 10*6*2.5cm/3.9*2.4*1in Weight: Approx.200g/7.1oz Package list:1 x USB CNC Controller Card 1 x Jog Handler 1 x USB cable 1 x CD1 x Connecting Cable Note: New-style and old-style are randomly