No. 1 Dual terminal secondary device means that under the same wechat account, users can log in to and use wechat functions on two devices at the same time, including chat, sending and receiving messages, and voice calls. In this way, users can use wechat anytime and anywhere without having to worry about being able to use it on only one device. At the same time, the No. 1 dual terminal secondary device can also synchronize multiple devices to ensure that chat records, contacts and other information on different devices are updated simultaneously, which is convenient for users to use.