A digital currency payment visual card system includes a digital currency payment visual card and a charging assembly, the digital currency payment visual card comprises a card body, a display module provided on on the card body, a controller and a positioning module, wherein the controller is arranged to complete transaction payment and output transaction information to the display module for displaying, wherein the positioning module is arranged to generate location information which is sent to an external device for locating the digital currency payment visual card, the charging assembly is a charging wallet or a charging clamp for electrically charging the digital currency payment visual card.

An intelligent tracking system generally includes one or more tracking devices, some of which may be passive tracking devices. Each passive tracking device includes one or more transceivers and is energized by an energizing signal. Some of these passive tracking devices may operate in a first communication mode or a second communication mode based on the energizing signal. Some tracking devices may include encryption modules or authentication modules. Some of these devices may incorporate a bulk acoustic wave oscillator.

An intelligent tracking system generally includes one or more tracking devices, some of which may be passive tracking devices. Each passive tracking device includes one or more transceivers and is energized by an energizing signal. Some of these passive tracking devices may operate in a first communication mode or a second communication mode based on the energizing signal. Some tracking devices may include encryption modules or authentication modules. Some of these devices may incorporate a bulk acoustic wave oscillator.

A digital currency payment visual card system includes a digital currency payment visual card and a charging assembly, the digital currency payment visual card comprises a card body, a display module provided on the card body, a controller and a positioning module, wherein the controller is arranged to complete transaction payment and output transaction information to the display module for displaying, wherein the positioning module is arranged to generate location information which is sent to an external device for locating the digital currency payment visual card, the charging assembly is a charging wallet or a charging clamp for electrically charging the digital currency payment visual card.

A device according to one embodiment includes a memory for storing information, wherein the device is operatively coupled to an electrical system of a vehicle via a wireless connection, wherein a presence of the device is required in order to start the vehicle.

This disclosure is generally directed to an RFID system that includes a hybrid RFID tag offering a functionality of a passive RFID tag and an active RFID tag. When operating as a passive RFID tag, an RF signal received from an RFID reader is harvested to produce a DC voltage for powering the hybrid RFID tag. The harvested DC voltage is coupled into a capacitor at a slow-charging rate so as to avoid a capacitor inrush current causing an abrupt power supply voltage drop. A controller chip in the hybrid RFID tag can execute some RFID functions at this time, thereby speeding up a response to the RFID reader. The capacitor is then charged at a fast-charging rate for storing a reserve charge. The hybrid RFID tag can subsequently use the reserve charge to operate as an active RFID tag without waiting for an RF signal from the RFID reader.

Systems and methods for secure and efficient transaction resolution and execution are provided. A method may include capturing, via a camera embedded in a smart card, an image of an object. The object may be associated with one of a plurality of service categories. The method may include processing the image and determining the service category, from the plurality of service categories, which is associated with the object. The method may also include determining a service provider that provides the service of the service category for a user associated with the smart card, and determining a monetary balance owed by the user to the service provider for the service. The method may also include executing a payment, via a wireless communication element that is embedded in the smart card, in the amount of the monetary balance, from an account associated with the user to the service provider.

A light-triggered transponder includes one or more of photo cells, a clock recovery circuit and a reverse antenna system. The clock recovery circuit (CRC) includes a photoconductor with a source terminal, a drain terminal for receiving a voltage, the photoconductor resistance varying with received light intensity. The CRC is configured to generate a recovered clock. A reverse antenna system connected to at least one photo cell and configured to transmit data. The photoconductor configured to produce a modulated voltage signal from an incident modulated light incident. The CRC can include an amplifier coupled to the source terminal of the photoconductor via a capacitor for receiving the modulated voltage signal and outputting an analog signal generated from the voltage signal. The CRC can include an inverter coupled to the amplifier and configured to digitize the analog signal of the amplifier.

Systems and methods for operating an Electronic Smart Tag (“EST”). The methods involve: operating the EST in a first operational state in which first item related information is output from an electronic output device of the EST that is powered by an energy storage device storing energy harvested from an external energy source; detecting when a charge level of the energy storage device reaches or falls below a first threshold level; and transitioning an operational state of the EST from the first operational state to a second operation state in which a message is output from EST requesting that a mobile device be placed in proximity to the EST for purposes of obtaining at least a first portion of the first item related information, in response to the detection that the charge level of the energy storage device has reached or fallen below the first threshold level.

Embodiments disclosed generally relate to a wireless identification tag with a response time that varies as a function of incoming signal frequency and system and methods for use thereof. In one implementation, the tag may include at least one antenna tuned to receive energy transmitted at a first frequency and at a second frequency. The tag may also include at least one transmitter. The tag may also include at least one circuit configured to detect whether energy is received in the first frequency or the second frequency, and to cause the at least one transmitter to transmit an immediate response when the second frequency is detected and to transmit a delayed response when the first frequency is detected.