This window contact is used to detect when a window is opened. If the window contact is connected to an ETKF head, the device will automatically reduce the temperature in the room during ventilation using the automatic temperature reduction function whilst windows are open. This enables heating costs to be lowered.

• Supply voltage: 3 V
• Batteries: 2 x LR 03 / Micro / AAA
• Battery life: approx 5 years.
• Working range: 30 m.