Transmitter Dimensions L x W x H: 38 x 75 mm Dimensions W x H x D: 38 x 75 x 14 mm Battery life: ca. 2 years Weight: 26 g AES authentication: Yes Batteries: 1 x LR03 (Supplied) Category: Light and output Colour: Black Display: LED Modular: Remote control Outdoor area: No RS485 Bus: No System: HomeMatic Free field range: 100 m Radio frequency: 868.3 MHz