Welcome to our store! 1. Maximum step pulse frequency is 100KHz, which is suitable for servo or stepper motor 2. Support automatic probe tool 3. Support emergency input 4. Support limit switch 5. Support connecting electronic handwheel Features: Support 4-axis linkage, you can connect four stepper motor drivers or servo units. Maximum step pulse frequency is 100KHz, which is suitable for servo or stepper motor. Support automatic probe tool. Support emergency input. Support limit switch. Support connecting electronic handwheel. Need to use external 24V DC power supply to isolate USB and external port, and to make the system more stable. Has 0-10V output port, you can use MACH3 software to control the spindle motor speed. 4 general inputs, you can connect the limit switch, stop switch, probe switch, back to zero and other devices. 4 general-purpose relay output interfaces, can drive four relays to control spindle starts, forward and reverse rotation, pumps, and other devices. Status LED, indicates the connection status on the board. Specifications: Size: Approx. 8 x 7.7 cm/3.15 x 3.03 inches Weight: 160 g Package Includes: 1 x USB CNC Controller Card 1 x USB Cable 1 x CD Note: Please note that the new type and old type of this product will be shipped randomly, and please make sure you don't mind before ordering. Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.