A method for tracking an object includes associating a beacon with a responder; transmitting a polling signal from the beacon to the responder; receiving a response from the responder; entering a low power state on the beacon for a predetermined duration; and transmitting an alert from the beacon responsive to a subsequent signal from the beacon failing to result in receiving a subsequent response from the responder. Embodiments also include a system in which the beacon and responder are configured to perform the described functions. In various embodiments, the duration during which the beacon remains in the low power state is predetermined based either on a default factory setting or a user adjustable setting.

A autonomous sensor includes a sensor configured to measure one or more events, a network interface, and a processor. The autonomous sensor is configured to communicate with a plurality of other autonomous sensors using the network interface. The processor is configured to detect, while in a discovery state, if an event has occurred and enter an active state if the event occurred, when an event has occurred, enter an active state, transmit event data to a parent while in the active state, detect the presence of a neighboring sensor; and when the neighboring sensor is detected, while in a nomadic state, monitor the activity of the neighboring sensor.

The invention relates to a complex proximity safety and warning system. The invention provides a safety system comprising a generator that generates a magnetic field that establishes a boundary, where the generator is capable of receiving radio frequency signals. Also provided is a radio frequency device that sends radio frequency signals, the radio frequency device being capable of sensing the magnetic field and generating a radio frequency response.

A device tag including a housing that includes a first connector structure constructed and arranged to engage with a battery operated device and a second connector structure constructed and arranged to slidingly engage with a battery such that the device tag is provided between the battery operated device and the battery. The device tag also includes an electrical connector carried by the housing and constructed and arranged to provide an electrical connection between the battery operated device and the battery. The device tag further includes an electronic device carried by the housing and constructed and arranged to transmit electrical signals.

A method of communicating with at least one power tool device using a power distribution box. The power distribution box includes a power-line adapter, a gateway device, and alternating current (AC) power outlets. The method includes receiving alternating current from an external power source and distributing the AC power received from the external power source to the AC power outlets. The method also includes receiving from the gateway device wireless communication from a power tool, transmitting by the power-line adapter the data from the wireless communication to an external network, and receiving information regarding the power tool device.

A child seat monitoring system includes an OBD dongle that the plugs into an OBD port within the vehicle, and a child safety clip carried by the child seat. The OBD dongle and the child safety clip include Bluetooth modules paired with one another. A parent mobile phone is carried by an occupant of the vehicle and includes a Bluetooth module paired with the Bluetooth modules in the OBD dongle and the child safety clip.

The parent mobile phone periodically transmits status messages to a backend server. The backend server analyzes the received status messages based on alert generation rules, and generates an alert in response to a measured temperature value within the vehicle exceeding a threshold, and the parent mobile phone is no longer in proximity to the vehicle while a child is still secured in a child seat. Alerts are transmitted by the backend server to mobile phones identified in a contact list.