do not have stand-alone show sequencing capabilities, and rely on a separate computer (usually a PC) to send it real-time sequences of dimmer commands. There are now several companies making equipment and software to do this, some are Light-O-Rama, HolidayCoro, and xLights. With Light-O-Rama software, users typically create sequences containing dimming instructions for the controllers. Physically on the controllers, multiple AC outlets can be precisely turned on, off, or dimmed. As this technology is used less for displays, other software such as xLights is used to control individually addressed LEDs, commonly referred to as "pixels". With pixels, designers can create whole house color effects, controlling the color and brightness of each individual bulb. This expands the possibilities for what designers can do given a constrained amount of lights. In addition to the lights, many displays incorporate an FM transmitter (personal device), allowing the synchronized music to be sent directly into families' vehicles. Many animated displays now use RGB lighting. A control technology being developed in Ottawa, Canada that enables multiple homes to link up over the Internet in-real time. A central Web site initiates the timing using Network Time Protocol to keep the local computers synchronized, and each location has a small Java program that controls a device which interfaces with the USB port to which one's holiday lights are connected. In this way, anyone online can "plug in" to this network and at their discretion, working independently or synchronized, engage their holiday light display on a global level. In the modern age, digital control of Christmas lights via Wifi or Bluetooth technology has emerged. The use of Wifi or Bluetooth allows the use of a smartphone app to change the color of the lights or produce different effects as well as to program animations to music or other sounds. In addition to the same technologies found with Bluetooth, the use of Christmas lights connected to Wifi can allow the lights to be controlled even from a remote location or to be tied into a smart home to turn on and off at preset times and to interact with other appliances in the home. Power considerations Incandescent (midget) or LED-based sets usually have each lamp connected in series to be powered without a transformer in the set. Screw-base C7 and C9 light sets use line voltage (120 volt) bulbs and are wired in parallel. LED-based sets use a current-limiting resistor