A casement window handle comprising: a mounting base, and a window handle wherein the window handle is movable between a latched position and an unlatched position, the mounting base being arranged to be mounted to part of a window sash movably mounted within a window frame, the casement window handle comprising a sensor system to indicate if the window sash is closed within the window frame and also if the window handle is in a latched position, the sensor system comprising: a first sensor and a second sensor, the first sensor comprising a first handle component (20, 120) mounted on a rotatable member (21, 121) of the window handle and a second handle component (22, 122) mounted within the mounting base in order to detect the window handle being in a latched position, the second sensor comprising a first window component mounted in the mounting base and a second window component being arranged to be mounted on the window frame in order to detect the window sash being located in a closed position; characterised in that the first handle component (20, 120) comprises a magnet (20, 120) and wherein the magnet (20, 120) is retained in a retaining recess defined in an outer circumferential surface of the rotatable member (21, 121). a mounting base, and a window handle wherein the window handle is movable between a latched position and an unlatched position, the mounting base being arranged to be mounted to part of a window sash movably mounted within a window frame, the casement window handle comprising a sensor system to indicate if the window sash is closed within the window frame and also if the window handle is in a latched position, the sensor system comprising: a first sensor and a second sensor, the first sensor comprising a first handle component (20, 120) mounted on a rotatable member (21, 121) of the window handle and a second handle component (22, 122) mounted within the mounting base in order to detect the window handle being in a latched position, the second sensor comprising a first window component mounted in the mounting base and a second window component being arranged to be mounted on the window frame in order to detect the window sash being located in a closed position; characterised in that the first handle component (20, 120) comprises a magnet (20, 120) and wherein the magnet (20, 120) is retained in a retaining recess defined in an outer circumferential surface of the rotatable member (21, 121). a first sensor and a second sensor, the first sensor comprising a first handle component (20, 120) mounted on a rotatable member (21, 121) of the window handle and a second handle component (22, 122) mounted within the mounting base in order to detect the window handle being in a latched position, the second sensor comprising a first window component mounted in the mounting base and a second window component being arranged to be mounted on the window frame in order to detect the window sash being located in a closed position; characterised in that the first handle component (20, 120) comprises a magnet (20, 120) and wherein the magnet (20, 120) is retained in a retaining recess defined in an outer circumferential surface of the rotatable member (21, 121).