This Intermatic T104 Mechanical Time Switch is a must-have for any home or business owner looking to keep their electrical system running smoothly. With a reliable dial control and durable construction, this timer is perfect for use with a variety of appliances and electrical systems. Whether you need to automate your lighting or ensure that your HVAC system is running efficiently, the Intermatic T104 is the perfect solution. Box definitely has issues. Was in garage for ever and never used.