There are many types of audio charging holes. Common ones include Micro USB, USB Type-C, and Lightning ports. Micro USB is an older standard that is widely used in Android devices. USB Type-C is a new generation interface with reversible pluggability and faster data transfer speeds, gradually replacing Micro USB. The Lightning connector is Apple's proprietary connector for iphones, ipads and some iPods. In addition, there are some speakers with unique charging interfaces that require specific charging cables or charging bases. When choosing a stereo, you need to pay attention to the type of charging hole to ensure compatibility with the device and easy charging.
There are three kinds, 6.35mm two-core TS, three-core TRS, Cannon (there is also a small three-core 3.5mm interface, generally refers to the stereo dual-channel interface, generally used for headphones and speakers computer interface)