// Get list of Microphone devices and print the names to the log
function Start () {
    for (var device in Microphone.devices)
    {
        Debug.Log("Name: " + device);
    }    
}    

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Start() {
        foreach (string device in Microphone.devices) {
            Debug.Log("Name: " + device);
        }
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Start():
        for device as string in Microphone.devices:
            Debug.Log(('Name: ' + device))