code: function Sms(opts) {
  
    if (!(this instanceof Sms)) {
      return new Sms(opts);
    }
  
    // Ensure opts is an object
    opts = opts || {};
    
    // API user 
    this.user = opts.user || null;
    
    // API password
    this.pass = opts.pass || null;
    
    // Message
    this.message = opts.message || null;    
  }
docs: Sms sender for FreeMobile API
  @constructor
  
  @param {Object} opts