cell phone jammer is very popular in the current market

In general, the longer the wavelength of the laser, the Focus on the limit will be greater.
U disk integrated heat sink maximum. And compared with ordinary receivers, integrated receiver U disk more than once within a three-chip: USB HUB chip, USB host chip and Flash chip. These three chips larger than the heat, add up to three relatively hot chips. U disk read and write frequently in time, this phenomenon is more obvious, its maximum internal temperature can reach 60 degrees. But it is still within the scope of the design does not affect the use of the product. Promise for the integration of wireless presenter products are the industry's mainstream chip brand in the heat control is a leader. If you can read U disk, USB controller chips may be a problem or Flash chips. In this case, as long as the USB HUB chip is working properly, the receiver is normally used.
U disk with the receiver: the receiver both as U disk, but also when the receiver. U disk without the receiver: the receiver only when the receiver. U disk itself is not the receiver. Receiver with U disk is based on the receiver chip built-in storage, realize U disc function. This is mainly due to cost increases caused. Ordinary U disk, and includes an USB host chip, a Flash chip. U disk promise of integrated receiver, in addition to the above two chips, but also add a USB HUB chip, while also increasing the complexity of the circuit a lot, so cost than a single U-disk to expensive. cell phone jammer is very popular in the current market. Green laser module technology used, the material has a high demand, the price of more expensive materials, production of the factory is relatively small, so the cost is relatively high.However, this simple circuit, there is no way to transmit power control, and battery power when the long distance remote control, remote voltage drop after a short distance. At the same time there are not any anti-jamming capability. At present, most manufacturers are willing to do 433M of product, technology is easy, the cost is relatively low. But there is anti-interference ability, the general problem of excessive battery consumption.Tab key: to achieve the hyperlinks in the document to jump between functions. ENTER: Enter key known mainly to open the selected hyperlinks, of course, can be used to page down. Laser keys: function is to control the laser on and off. PowerPoint software to support custom animations, such as flying text, typewriter effects. As long as PowerPoint animation settings of their own, an action can be achieved by one action of the remote control, such as the appearance of the text line by line list.
Laser pointer to use radio frequency technology to transmit remote control signals. Relative to the infrared technology, RF technology and 360-degree transmission diffraction, no direction, between the transmitter and the receiver does not need alignment. As long as the receiver is not surrounded or covered by a metal, can achieve the remote control.