A cradle for a wireless monitor includes a body, a monitor connection port, a wireless communications module, a computer signal input port, a TV tuner, and a TV signal input port. A switch including a control circuit and a user actuated mechanical mechanism is electrically connected between the monitor connection port and the wireless communications module, and the computer signal input and the TV tuner. The control circuit detects states of the computer signal input port, the TV tuner, the monitor connection port, and the wireless communications module and controls the switch accordingly to establish connections.