WIFI: WiFi is the abbreviation for IEEE 802.11b protocol, It is the technology with the fastest transmission speed at present. The product cost is low. It is more popular in current life. The most convenient thing is that it can be used only by purchasing components and connecting to WiFi network. Therefore, at present, smart home products based on WiFi technology account for the largest market share. The disadvantages are poor security, weak stability, high power consumption and limited connectable devices. The number of WiFi switches in the development of smart home appliances is far more than that of the general 16, but it will not be much more than the actual number of WiFi switches in the development of home appliances.Zigbee: ZigBee is the abbreviation of IEEE 802.15.4 protocol, is a short-range, low complexity, low-power, low-speed and low-cost two-way wireless communication technology. ZigBee can work in three frequency bands: 2.4GH (global), 868mhz (Europe) and 915MHz (United States). The maximum is 250kbit / s, the minimum is 20kbit / s, and the transmission distance is between 10-75m. ZigBee's security is recognized as relatively good. AES-128 encryption is adopted. In addition, ZigBee network has strong self-organizing network and self-healing abilityBluetooth: Bluetooth is a short-range communication technology based on 2.4GHz frequency band. It can exchange wireless information in smart devices such as mobile phones, tablets and laptops. Through Bluetooth technology, devices without networking capability can be connected to the Internet indirectly. Based on its low-power characteristics and the popularity of smart phones, Bluetooth is the first choice of many smart home products, such as home door locks, curtains, lighting, and even smart switches. In practical application, Bluetooth protocol can realize the device connection scheme. The product is connected to the smart phone through Bluetooth protocol, and then connected to the product through the Internet to realize remote viewing and control.Z-Wave: Z-Wave is a new short-range wireless communication technology based on RF, low cost, low power consumption, high reliability and suitable for network. The working frequency band is 908.42mhz (USA) ~ 868.42mhz (Europe). FSK (BFSK / GFSK) modulation mode is adopted. The data transmission rate is 9.6 Kbps. The effective coverage range of the signal is 30m indoors and more than 100m outdoors. It is suitable for narrow bandwidth applications.NB-Lot: NB IOT adopts cellular technology and operates in the operating frequency band below 1GHz, directly deployed on the base station of the network operator. They can be networked like mobile phones. There is a built-in nb-iot IOT card (similar to mobile phone card). no need to configure another gateway, but they need to pay to the operator.Lora: Lora operates in non operating frequency band and adopts linear frequency modulation technology. There is no additional charge for application and the cost is low.Infrared: It can be used for indoor and outdoor point-to-point, wireless infrared LAN communication and military infrared fuze. It has been widely used in mobile computing and mobile communication equipment.Wireless RFID: Radio frequency technology is a kind of wireless communication technology with short distance, low complexity, low power consumption, low data rate and low cost. The control signal is transmitted by radio frequency to realize the control of household appliances and lights. There is no need to rewire, and the installation, setting and commissioning are relatively convenient. At present, the radio frequency technology with frequencies of 315MHz and 433MHz is mainly used.