compact design, simple and quick to install - also for retrofitting in conjunction with temperature sensors a room temperature controller and a heating server are required for control purposes maintenance-free, self-calibrates and communicates bi-directionally with EnOcean controllers precise temperature control for every room energy self-sufficient through Micropelt thermogenerator, converts temperature differences into electrical energy, makes batteries superfluous local operation possible via rotary knob LED display red/green and sound signal for operating assistance Technical details Operation also possible in the transition period/summer due to internal energy storage according to default Sleep mode in summer EnOcean radio 868 MHz (ISO/IEC 14546-3-10) EnOcean Protocol A5-20-01, Position in % Ambient temperature during operation 0 to 50 °C Standard valve connection M30 x 1.5/Adapter possible Compact design 59 x 64 x 59 mm (L x H x D) Weight: 260 g