When you select to install limit switches, you can switch to interlock operation; simply press the stop button at the desired location. 8V-36V DC motor forward and reverse controller with limit function Uses two 10A relays (safe use range within 5A) It is recommended to use the motor within 60W for safety The initial state is power off, the motor stops, and after power off, it maintains the initial state. Please switch modes after power off, otherwise it be invalid. When you select switch, you can switch to non-locking use, and the motor can move however much. Motor, electromagnet, positive/negative pole conversion device., Weight: 0.24912235606 pounds, Manufacturer: Prterver