Wireless digital temperature controller 4in1, black, surface-mounted VS20BRF, battery powered 4xAAA 615172644

The VS20WRF/VS20BRF controller can be configured to operate as: Programmable Temperature Controller (PRT), Controller Group Controller (Master), Group Controller (Slave) and Timer DHW. The 4-in-1 controller can communicate with any of the following devices:
KL10RF/KL08RF - Central strip to control underfloor heating
TRV10RF - Thermostatic head
RX10RF - Receiver
The VS10WRF/VS10BRF controller can only communicate with other wireless components of the iT600 system using the CO10RF coordinator unit (sold separately).
Basic properties:
Three temperature levels (comfortable, standard and economical)
Additional functions: PARTY and HOLIDAY
Possibility to work in manual mode (permanently or temporarily)
Output for an additional floor temperature