Button Used to switch between mode one and mode two. Holding the button connects a computer or mobile phone to switch between the two modes. In mode one, this button can move the mouse . This function is especially important on mobile phones. Pressing and holding this button moves the mouse downward. If you move to the bottom of the mobile phone screen and continue to hold, the mouse moves upward from the bottom. Electric key interface You can directly connect the hand key and the automatic key. To connect the hand key, first connect the hand key, then connect the mobile phone or computer. This device intelligently identifies whether the connected input is the hand key or the automatic key. Use scenarios Mobile phone navigation: While using a mobile phone, use mode one and hold the button to move the mouse to the bottom or of the screen to facilitate navigation. Computer control: Switch between modes to control the mouse from a computer, enabling quick mode changes during use. Dualkey setup: Connect either the hand key or the automatic key; the device detects which key is connected and configures accordingly for seamless operation.