The ornamental design for a sirenswitch, as shown and described.
FIG. 1 is a front perspective view of a siren switch of my new design;
FIG. 2 is a front view of the siren switch thereof;
FIG. 3 is a rear view of the siren switch thereof;
FIG. 4 is a left view of the siren switch thereof;
FIG. 5 is a right side view of the siren switch thereof;
FIG. 6 is a top side view of the siren switch thereof;
FIG. 7 is a bottom view of the siren switch thereof; and,
FIG. 8 is a rear perspective view of the siren switch thereof.
The broken line showing of connection ports is included for the purpose of illustrating portions of the “article” and forms no part of the claimed design.