System 3000 Room Temperature Controller BT in glossy cream white, System 55. Operation and programming via mobile device (smartphone or tablet) via Bluetooth with the Gira System 3000 app. Control via capacitive touch surface. Manual and time-controlled regulation of room temperature. Functions on the attachment: Current time can be saved as a switching time, quick programming. Automatic summer/winter time changeover, can be deactivated. Timer with three memory areas, each memory area for comfort and setback time for Monday to Friday and Saturday as well as Sunday. Setting for comfort, setback, cooling, and frost protection temperatures. Controller output: Pulse width modulation (PWM) or 2-point control. Heating optimization (temperature reached at the set time). Adaptation to valves (normally open or normally closed). Activation of cooling operation via the attachment. Supports internal and external temperature sensors. Temperature drop detection. Operating lock. Valve protection function. Display turns off after 2 minutes, permanent display of the current time possible. Functions with Gira System 3000 app: Weekly timer with 40 individually programmable switching points and temperatures. Holiday mode (start, end, temperature). Boost function: Rapid heating for a maximum of 5 minutes. Locking of local operation possible. Integration of an external temperature sensor via Bluetooth. Minimum and maximum temperature values adjustable. Copying of settings and time programs to additional attachments possible. The combination of attachment 5393xx with 540700 is only possible from I05 (index) onwards. When connected to the Gira System 3000 app, the time and date are updated.