The product number "181-5" likely designates a specific model, possibly from around 1995, when it retailed for 59.90 Deutsche Marks. The full reference number associated with this timer is DIEHL 05178 . This "Multi-Timer" is part of Diehl's broader range of control solutions, which includes electronic control systems and mechanical timers for domestic appliances and HVAC equipment.

The Diehl Multi-Timer 181-5 is a feature-rich device. Here are its core capabilities:

The number and a bulb icon will appear, indicating the first "On" event.