Abstract: Apparatus (100, 300, 400) for providing visual and/or audible alert signals. The apparatus (100, 300, 400) comprises one or more lighting means (e.g., 105) for providing visual signals and siren means (e.g., 104) for generating at least one selected siren tone. The apparatus (100, 300, 400) also comprise speaker means (e.g., 103) for producing the audible alert signal based on the selected siren tone and magnetic attaching means (108) for attaching the apparatus (100, 300, 400) to the exterior of a vehicle housing magnetic attraction, wherein at least a portion of the magnetic attaching means (108) is configured to be de-energised in order to detach the apparatus (100, 300, 400) from the exterior of the vehicle.