An electrical switch unit for use with a variable speed electrical device to control operation of a DC motor of the electrical device, the electrical switch unit comprising: a housing (205,305) which houses a pair of electrical switching contacts, and, an actuator (207,307) operably connected with at least one of the pair of electrical switching contacts, the actuator (207,307) being configured for movement relative to the pair of electrical switching contacts in response to operation of a finger-operable trigger so as to arrange the pair of electrical switching contacts into at least one of a closed-circuit configuration wherein power is able to be supplied from a DC power source to the DC motor and, an opened-circuit configuration wherein power is not able to be supplied from the DC power source to the DC motor via the pair of electrical switching contacts; a signaling module associated with the electrical switch unit comprising signaling circuitry for sensing the movement of the actuator (207,307) and outputting a signaling module signal indicative of the sensed movement or position of the actuator (207,307); a power module (203,303) comprising at least one power switching device for controllably supplying power from the DC power source to the DC motor; and a control module (201,301) comprising control circuitry for receiving the signaling module signal, and responsive to the received signaling module signal, outputting a control module signal to control the at least one power switching device of the power module (203,303) wherein the at least one power switching device controllably supplies power from the DC power source to the DC motor to allow operation of the DC motor at a speed corresponding to the sensed movement or position of the actuator (207,307); wherein the at least one of the pair of electrical switching contacts, the signaling module, the control module (201,301) and the power module (203,303) are integrally formed together in a single PCB, said PCB including at least one of electrical conductive pins, conductive pathways, and conductive buses integrally embedded in the PCB via which the at least one of the pair of electrical switching contacts, the signaling module, the control module (201, 301) and the power module (203, 303) are in electrical communication, the control module (201,301) is configured to extend outwardly of the housing (205,305) so as to terminate at a distal end of the control module (201,301), and characterised in that the electrical switching contacts are arranged in series in an electrical circuit between the DC motor and the DC power source, wherein in the closed-circuit configuration the power is able to be supplied from the DC power source to the DC motor via the pair of electrical switching contacts. a housing (205,305) which houses a pair of electrical switching contacts, and, an actuator (207,307) operably connected with at least one of the pair of electrical switching contacts, the actuator (207,307) being configured for movement relative to the pair of electrical switching contacts in response to operation of a finger-operable trigger so as to arrange the pair of electrical switching contacts into at least one of a closed-circuit configuration wherein power is able to be supplied from a DC power source to the DC motor and, an opened-circuit configuration wherein power is not able to be supplied from the DC power source to the DC motor via the pair of electrical switching contacts; a signaling module associated with the electrical switch unit comprising signaling circuitry for sensing the movement of the actuator (207,307) and outputting a signaling module signal indicative of the sensed movement or position of the actuator (207,307); a power module (203,303) comprising at least one power switching device for controllably supplying power from the DC power source to the DC motor; and a control module (201,301) comprising control circuitry for receiving the signaling module signal, and responsive to the received signaling module signal, outputting a control module signal to control the at least one power switching device of the power module (203,303) wherein the at least one power switching device controllably supplies power from the DC power source to the DC motor to allow operation of the DC motor at a speed corresponding to the sensed movement or position of the actuator (207,307); wherein the at least one of the pair of electrical switching contacts, the signaling module, the control module (201,301) and the power module (203,303) are integrally formed together in a single PCB, said PCB including at least one of electrical conductive pins, conductive pathways, and conductive buses integrally embedded in the PCB via which the at least one of the pair of electrical switching contacts, the signaling module, the control module (201, 301) and the power module (203, 303) are in electrical communication, the control module (201,301) is configured to extend outwardly of the housing (205,305) so as to terminate at a distal end of the control module (201,301), and characterised in that the electrical switching contacts are arranged in series in an electrical circuit between the DC motor and the DC power source, wherein in the closed-circuit configuration the power is able to be supplied from the DC power source to the DC motor via the pair of electrical switching contacts.