A personal wearable monitor for monitoring a bio-electrical signal from a person. The monitor is adapted for detecting an upcoming seizure, and for providing an acoustical information signal. The monitor is provided with a first speaker (13) for providing the information signal, and a second speaker (14) is adapted for functioning as a microphone in testing if said first speaker is capable of providing a sound. The second speaker is also a back-up speaker. The monitor is adapted for providing a notification in the event that the second speaker (14) does not detect the generated sound from the first speaker (13).

An output device emits alarm indicating light and sound at predetermined levels when activated. The device enters a test mode in response to received test mode indicating control signals. When the device is in the test mode and a local test initiating control signal is received, audio and/or visual outputs are emitted at a level reduced from the alarm indicating output levels to test those outputs.

An emergency lighting system and a method for operating same. The emergency lighting system includes an area control device, a storage device, an external device and a plurality of emergency lighting devices operably connected to the area control device. In addition, each emergency lighting device includes a light, a controller having an electronic processor configured to perform a self-diagnostic test, and an input/output (I/O) device for transmitting data associated with the self-diagnostic test, and wherein each of the plurality of emergency lighting devices is configured to wirelessly communicate with one another. The area control device may wirelessly receive data associated with the self-diagnostic test from at least one of the plurality of emergency lighting devices, and may wirelessly transmit the data associated with the self-diagnostic test of any of the plurality of emergency lighting devices to at least one of the storage device and the external device.

A sounder device includes a sounder circuit that comprises a piezo-electric element, a capacitor of a predefined capacitance configured parallel to the sounder circuit, the sounder circuit is connected to the capacitor, and a power source via a switch. The sounder device further includes a controller that is configured to issue a voltage control signal to enable supply of electrical power from the power source to the capacitor to charge the capacitor to a predetermined voltage, and issue a first switching control signal to control switching of the switch at a predetermined duty cycle, to enable the capacitor to supply the predetermined voltage across the sounder circuit at the predetermined duty cycle, the sounder circuit is configured to generate acoustic signal of a predefined sound level and tone based on the predetermined voltage being supplied to the sounder circuit at the predetermined duty cycle.