A control device for controlling the environment in a region within a structure by means of controlling operation of a control system adapted to adjust at least one property of the environment in the region, the control device comprising: a user interface adapted to: selectively indicate to a user a range of available values representing at least one property of the environment in the region that is adjustable by the control system; and enable the user to control the represented at least one property, whereby the control device is provided with user input; and a communication unit adapted to adjust the at least one property by means of communicating a control signal corresponding to said user input to the control system; wherein the user interface is adapted to selectively indicate to the user a range of available values representing at least one property of the environment in the region that is adjustable by the control system at least based on presence information of any persons being present within the region such that the extent of control of the environment in the region by means of the control device that is thereby enabled the user is based at least partly on the presence information; wherein the amount, type and/or numerical range of control options that are indicated to the user by the user interface are selected based at least partly on the presence information, such that the extent of control of the environment in the region by means of the control device that is enabled the user is greater the lower the number of persons being present within the region. a user interface adapted to: selectively indicate to a user a range of available values representing at least one property of the environment in the region that is adjustable by the control system; and enable the user to control the represented at least one property, whereby the control device is provided with user input; and selectively indicate to a user a range of available values representing at least one property of the environment in the region that is adjustable by the control system; and enable the user to control the represented at least one property, whereby the control device is provided with user input; and a communication unit adapted to adjust the at least one property by means of communicating a control signal corresponding to said user input to the control system; wherein the user interface is adapted to selectively indicate to the user a range of available values representing at least one property of the environment in the region that is adjustable by the control system at least based on presence information of any persons being present within the region such that the extent of control of the environment in the region by means of the control device that is thereby enabled the user is based at least partly on the presence information; wherein the amount, type and/or numerical range of control options that are indicated to the user by the user interface are selected based at least partly on the presence information, such that the extent of control of the environment in the region by means of the control device that is enabled the user is greater the lower the number of persons being present within the region. <EOS>