An electronic device is configured to perform electric field communication via an electric field transmission medium. The electronic device includes a housing. The electronic device also includes a first electrode portion for electric field communication including a first electrode and a second electrode, a second electrode portion for electric field communication including a third electrode and a fourth electrode, and a differential amplifier. The second electrode is disposed further in a direction towards the inside of the housing than the first electrode. The fourth electrode is disposed further in a direction towards the inside of the housing than the third electrode. The first electrode and the second electrode are connected to a first input terminal of the differential amplifier. The second electrode and the fourth electrode are connected to a second input terminal of the differential amplifier.

A smart personal safety device includes a chemical irritant that may be dispersed by a user in the event of a threat by an attacker. The smart personal safety device includes an alert signal sent when the user activates the smart personal safety device, sending an alert signal to a mobile device for security alert management by software contained on the mobile device.

A transmitter for a car includes a cable, a housing and a mounting member. The housing includes therein a magnetic member, a circuit board, a Bluetooth module, an FM transmitting module, and a control module that are electrically connected to the circuit board. The cable is electrically connected to the circuit board. The mounting member is rotatable with respect to the housing. After the Bluetooth module is connected to the electronic device, the control module is used to receive an audio file transmitted from the electronic device through the Bluetooth module, and process the audio file into audio signals. The control module is further used to transmit the audio signals to the FM transmitting module, and the FM transmitting module is used to transmit the audio signals to a car radio of the car.

A transmitter for a car includes a cable, a housing and a mounting member. The housing includes therein a magnetic member, a circuit board, a Bluetooth module, an FM transmitting module, and a control module that are electrically connected to the circuit board. The cable is electrically connected to the circuit board. The mounting member is rotatable with respect to the housing. After the Bluetooth module is connected to the electronic device, the control module is used to receive an audio file transmitted from the electronic device through the Bluetooth module, and process the audio file into audio signals. The control module is further used to transmit the audio signals to the FM transmitting module, and the FM transmitting module is used to transmit the audio signals to a car radio of the car.

A vehicle card-type smart key that it includes a tact switch; and a touch input unit for sensing a touch from a user; and a control unit which performs an action related to the button input only when both a button input from said tact switch and a touch input from the touch input unit exist.

An antenna for a mobile phone and a mobile phone having the same are provided. The antenna for a mobile phone includes: a metal mobile phone case provided with a first slot and a second slot intersecting with the first slot; a circuit board having a clearance zone and a parasitic branch stretching into the clearance zone, and disposed within the metal mobile phone case; an exciting sheet disposed between the circuit board and the metal mobile phone case, and across the first slot in a width direction of the first slot; a dielectric filler disposed between the exciting sheet and the metal mobile phone case, and configured to fill the first slot and the second slot.

An electronic device is configured to perform electric field communication via an electric field transmission medium. The electronic device includes a housing. The electronic device also includes a first electrode portion for electric field communication including a first electrode and a second electrode, a second electrode portion for electric field communication including a third electrode and a fourth electrode, and a differential amplifier. The second electrode is disposed further in a direction towards the inside of the housing than the first electrode. The fourth electrode is disposed further in a direction towards the inside of the housing than the third electrode. The first electrode and the second electrode are connected to a first input terminal of the differential amplifier. The second electrode and the fourth electrode are connected to a second input terminal of the differential amplifier.

A mouth activated controller can be useful for operating equipment such as welders, drills and other equipment which may have traditionally utilized other controllers in the past, like foot controllers, etc. The mouth controller could operate in a live mode such as based on the pressure applied to a mouth pad, such as through teeth, or a step mode whereby a number of bites controls operation of the equipment for at least some embodiments.

A mouth activated controller can be useful for operating equipment such as welders, drills and other equipment which may have traditionally utilized other controllers in the past, like foot controllers, etc. The mouth controller could operate in a live mode such as based on the pressure applied to a mouth pad, such as through teeth, or a step mode whereby a number of bites controls operation of the equipment for at least some embodiments.

To wirelessly transmit, from intrinsically-safe type equipment placed in a hazardous area, a loop electrical signal measurement value obtained from flameproof type equipment. A flameproof input intrinsically-safe output transmitter covered with a flameproof enclosure includes an intrinsically-safe-side terminal connected to an intrinsically-safe built-in battery type wireless device, a flameproof-side electrical signal terminal configured to input a loop electrical signal, and an electrical input signal transmitter circuit configured to measure the loop electrical signal and transmit a signal in accordance with a measurement result to the intrinsically-safe-side terminal.