Magnetic Contact is a kind of security alarm device, consists of two parts, wireless transmitter and permanent magnets, used to detect the door, window and drawer is illegally open or mobile, divided into wireless magnetic door, gate magnetism, cable magnetic door 3 kinds.
Magnetic Contact is a security alarm system, door magnetic, window magnetic (same principle, different shape). door/window magnets are not easy to see if you don't pay attention to them.So-called magnetic magnetic door/window is short for window door magnetic Switch and magnetic switch, consists of two parts: small parts for permanent magnets, inside has a permanent magnet, used to generate a constant magnetic field, the magnetic door is the main body, inside it there is a normally open type dry reed pipe, when the permanent magnet and reed pipe very close (less than 5 mm), door Magnetic Sensor is in a state of work waiting for you, when permanent magnet after leaving the dry reed pipe length, in a normally open state.Magnet and reed pipe respectively installed on the frame (frame) and the door leaf (casement), basically all is embedded installation (also have a surface type installation), so it's not the industry generally is not able to notice these.You can open the ledger of outside the door and window, look at the household outside door frame at the top and the sash of the window, can see the rounded, usually in white components, and in fact this is the so-called door magnetic, magnetic window.
Magnetic Contact Magnetic Contact,Negative Contact,Positive Contact,Button Cell Contact Ningbo Best Group Co.,Ltd , http://www.speakerbuzzer.com
Although the US government does not provide economic subsidies or preferential policies for enterprises, its distinctive industry-oriented and consumption-oriented policies provide a direction for enterprise development. Since 2009, the US government has been pursuing a green energy-oriented industrial policy and has driven the energy-saving trend of consumer energy products.
The industry said that another reason for the return of the LED industry is that US venture capital is optimistic about the return of LED. According to statistics, in 2009 alone, venture capital investment in the US LED industry reached 300 million US dollars, most of these enterprises are emerging enterprises. 
US government promotes green energy industry policy to drive LED energy conservation
According to the US Department of Energy, after 2015, the global sales of LED lamps will exceed 18.2 billion US dollars, and may reach 65 billion US dollars in 2020, which will cover 70% of the lighting market share. At that time, LED lighting products will fully enter the traditional lighting field. Become the main lighting method in the world.