Using this timer is easy. First, find a suitable location for it. Make sure to align the four mounting holes with the surface you want to attach it to and secure it properly. For electrical connections, connect the wires to the appropriate terminals according to whether you need the normally open or normally closed contacts. To start the timer, wind it up to set the 2 - hour duration. When using the timer, avoid over - winding it as this may damage the internal mechanism. Also, keep it away from excessive heat, moisture, and dust to ensure its normal operation. For maintenance, you can gently wipe the exterior with a dry cloth from time to time. If you notice any problems with the timer, such as inaccurate timing or contact issues, don't try to repair it yourself. Instead, contact a professional or our customer service for assistance.