The force activated switch (14) has a force threshold at which the force activated switch (14) is activated to energise the buzzer (22) to sound.

A trigger activated switch for a firearm is disclosed.

An indicator system includes a human perceptible indicator, a motion-activated switch, and a controller in electrical communication with the indicator and the motion activated switch.

The LPG fuel supply is controlled by an accelerator pedal position sensor/switch and a Diesel fuel pressure actuated switch.

A force activated switch (14) in the electrical circuit is activated to energise the buzzer (22) to sound in response to displacement of the training aid.

The force activated switch (14) is configured so that the force threshold is user adjustable.

A battery powered cigarette lighter having a switch which is activated by a change in air pressure or air flow is described.

Extending laterally across the first surface of the substrate, the laser activated switch includes at least one pair of first and second electrically conductive electrodes.

In one embodiment, the laser activated switch further includes first and second terminals electrically connected to the first and second electrodes, respectively.

An electronic circuit provides a signal based on the uppermost activated switch to provide a signal that is monotonic with liquid level.

The controller includes a non-transitory memory storing first and second indicator sequences, and a counter counting a number of activations of the motion-activated switch.

When the user activated switch closes its associated resonant circuit, the resonant circuit consumes energy from the electromagnetic field at its resonant frequency.

Moreover, the control of a horse is further effected by ensuring correct posture when sitting on a horse such as by modifying the indicator device above to operate in response to a switch activated by deviation from a horizontal or vertical plane.