DEVICE, METHOD, AND GRAPHICAL USER INTERFACE FOR ESTABLISHING A RELATIONSHIP AND CONNECTION BETWEEN TWO DEVICES

A device receives an instruction to authorize a relationship corresponding to communication over a first data connection with a peripheral display unit, and receives authentication data from the peripheral display unit over another data connection. The device then establishes a connection with the peripheral display unit over the first data connection, including providing the authentication information to the peripheral display unit. The device monitors a battery charge level and battery-usage patterns and provides alerts in accordance therewith. The device displays a reconfiguration interface for configuring the user interfaces of one or more peripheral display units, and detects a request to configure an interface of a peripheral. In response to detecting the request, the device displays an updated representation of the peripheral interface, and afterwards transmits instructions to the peripheral to display the user interface in accordance with the request.