Sensor Dimensions L x W x H: 17 x 77 mm Dimensions W x H x D: 17 x 77 x 16 mm Battery life: ca. 2 years Weight: 35.1 g AES authentication: Yes Batteries: 2 x LR44 Category: Safety technology Colour: White Display: LED Modular: Sensors Outdoor area: No RS485 Bus: No System: HomeMatic Free field range: 100 m Radio frequency: 868.3 MHz