The switch has dual control and single control of difference, dual control each unit more than a single control terminal. A light in the room can be controlled outside the room can also be controlled called dual control, dual-control switch can be a single control with high-quality wall switch, but not for single control switch dual control. 1, classified according to the switch to start the switch to points mode: pull switch, rotary switch, pull down the switch, button switch, rocker switch touch switch, reset switch, tap switches 2, commonly switch connection classification according to press the switch. Connection to the point: single control switch, dual-control switch, bipolar (dual) dual-control switch. 3. Press the Size by Size Score: 86, 118 type, 120 geographical distribution: Most domestic use 86 switch (80% of the area), with some parts of 118, 120 less. Wall switches, sockets need to focus on brand to buy, do not plan cheaper to buy some no-name products. Actually, the most is not the province of electric materials and water materials, which if there are problems in the decoration. Often accompanied by more serious consequences for the production of electrical wall switch good intentions, so they need special care. Many well-known brands such as the market switches have 'continuous switching a thousand times' commitment, under normal circumstances you can use for ten years or even longer, the price was expensive, but comprehensive comparison or cost-effective. (1) the appearance of good quality switches and sockets mostly use bullet-proof plastic and other advanced materials, there are also metal wall gold, stainless steel, copper and other switches, its surface smooth, uniform color, no glitches, scratches, stains and other defects, It has excellent fire, moisture, impact performance. At the same time the brand logo on the packaging should be clear, there are security signs, the national electrical safety certification of 'Great Wall sign', the state 3C Certification and clear address phone manufacturers, there are instructions and certificates. (2) handle the plug socket rated not less than 5000 times the number of plug plug requires a certain intensity, elastic fit Vicki electrical wall switch, internal copper has a certain thickness; the nominal switching frequency switch should be greater than 10 000 second, the open feel and flexible, not tight astringent, no sense block, switch button to stop somewhere in the middle of the situation does not occur; Dian Dian also switch weight, high-quality products because the extensive use of copper and silver metal, component sense than enough, will not have the feeling of floating. Wall switch specifications, wall switches, electrical good intentions by Hebei Tianyi Electric Co. Hebei Tianyi Electric Co., Ltd. (www.tianyidq.com) strong, credible, in Xingtai wall switch industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Tianyi Electric into the brilliant and you work for a better future!