1PC USB Mini Fan Portable Desk LED Light Fan Air Cooler

The foot warmer is a foot warmer product, with ergonomic shape, beautiful color, meter and radian design, can be shaken back and forth, increase the space for foot movement, promote the blood circulation of the foot, and make the foot warm faster. This product is a perfect combination of warm shoes and electric warm treasures, with novel and practical features. It not only retains the simplicity and comfort of traditional warm shoes, but also makes up for the defect of insufficient heat; it not only absorbs the advantages of continuous heating of electric heating shoes, but also overcomes the shortcomings of live use. Household anti-theft device is a household anti-theft electronic device designed with the latest material technology, the latest information technology and the latest artificial intelligence. To a certain extent, it can effectively deter illegal intruders and protect personal and property safety. Let the anti-theft device have wisdom and soul, so that the security of people and property can break through the limitations of time and space. In terms of performance, it must be highly reliable under various working conditions. In terms of function, it must not only allow users to have the highest security level that cannot be cracked, but also allow users to operate easily, and even the system will automatically serve users.
Home anti-theft device, the ultimate purpose is to prevent problems before they happen, to protect our lives and property safety tools! Home anti-theft device is a vehicle monitoring technology based on mobile communication network, which completely solves the problems of remote alarm, remote control and easy cracking that cannot be solved by ordinary anti-theft devices and monitors. Using communication encryption technology, even if the remote control and car keys are stolen or copied, you cannot drive away your car; "mobile phone monitoring", "online monitoring", "on-site alarm", "remote alarm", "power failure alarm" , "Linkage fortification", "Signal disappearance alarm", "Full voice prompt" and other functions make your car safe and worry-free! No matter when and where you are, you can monitor your car by phone, and let it get the best protection. It is a new generation of anti-theft products after one-way anti-theft device and two-way anti-theft device.
It is expected that the direction of the Internet of Things that is being studied at this stage will be the main force of household anti-theft in the future. type
Intelligent anti-theft devices are generally divided into two types, one is the car anti-theft type, and the other is the home anti-theft type.
The car anti-theft device is an electronic device to prevent the theft of household cars; the home anti-theft device is an electronic device to prevent the theft of household items. The network positioning intelligent anti-theft device conforms to the almighty anti-theft technology function parameters:
1: Timely Notification: Worldwide
2: Difficulty of stealing cars: remote monitoring
3: Highest security: no decoding
4: Easy to operate: linkage automatic
5: Practical functions: car search and anti-robbery 1. Telephone alarm: Six-way telephone automatic alarm, which can notify the owner's mobile phone and landline.
2. Eight defense zone display: Eight defense zone display, you can clearly know the location of the alarm
3. Learning code pairing: The wireless connection between the detector and the host computer is easy to expand by learning the code pairing method.
4. The selection of the siren sounding time: This function can set the length of the on-site siren sounding time when the alarm is dialed when the siren is in the start mode. The time can be set from 1 to 30 minutes, and the maximum 30 minutes is the continuous sound mode.
5. Remote control ring times setting: This function can limit the number of rings when incoming calls are made.
6. Delayed arming: The user can set a certain time for the host to automatically arm, and the delay time is: 0-99 seconds.
7. Quick setting: The user can quickly set the phone number through the keyboard of the product control panel. The transmitting part is generally divided into two types, namely the remote control and the transmitting module. The remote control and the remote control module are for the way of use. The remote control can be used independently as a whole machine, and the external lead wire has a wiring head; and the remote control The module is used as a component in the circuit, and it is applied according to its pin definition. The advantage of using the remote control module is that it can be seamlessly connected with the application circuit, small size, low price, and the best use of everything, but the user must really understand the circuit. Principle, otherwise it is convenient to use the remote control.
receiving part
The receiving part is generally divided into two types, namely super-heterodyne and super-regenerative receiving methods. The super-regenerative demodulation circuit is also called a super-regenerative detection circuit, which is actually a regenerative detection circuit working in the intermittent oscillation state. The superheterodyne demodulation circuit is the same as the superheterodyne radio. It is set up with a local oscillator circuit to generate an oscillating signal, and after mixing with the received carrier frequency signal, an intermediate frequency (usually 465kHz) signal is obtained. Detect and demodulate the data signal. Since the carrier frequency is fixed, its circuit is simpler than that of a radio. The super-heterodyne receiver is stable, has high sensitivity and relatively good anti-interference ability; the super-regenerative receiver is small in size and cheap.