A charger is a power adapter used to charge electronic devices. According to different device and interface standards, there are multiple models of chargers available. Here are three common charger models:

　　1. USB charger: USB (Universal Serial Bus) charger is one of the more common and widely used charger models. It adopts the USB interface standard and can be used to charge various devices such as mobile phones, tablets, Bluetooth earphones, etc. USB chargers typically have standard USB Type-A or USB Type-C ports for connecting charging cables and devices. USB chargers can be classified into different levels based on their output power, such as regular chargers, fast charging chargers, and chargers.

　　2. Wall plug charger: Wall plug chargers are also a common type of charger, typically used to charge small devices such as smartphones and tablets. It adopts a design that can be directly plugged into a wall socket, eliminating the step of using a USB cable for connection. Wall mounted chargers typically consist of one or more output interfaces, which can charge multiple devices simultaneously. In addition, some wall chargers also come with detachable plugs that can be replaced with power plugs from different regions to adapt to different countries and regions.

　　3. Wireless charger: A wireless charger is a charging method that does not require the use of a charging cable to connect devices. It transfers electrical energy to the device through wireless electromagnetic induction or resonance principle to achieve charging function. Wireless chargers typically consist of a charging dock and a charging receiver (usually a device back cover or internal component). Users only need to place the device on the charging dock to achieve charging without inserting any cables. Wireless chargers are widely used in devices such as smartphones and smartwatches, providing users with a convenient charging experience.

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