The PROMASTER UNPLUGGED m400 MONOLIGHT is a high-powered, wireless strobe that gives you the freedom to light a subject from just about anywhere. A wireless transmitter is included, so you camera can fire the lights' built in receivers up to 300' away on one of 16 channels. The m400's controls are straightforward and reliable. Turn the audible alarm and LED modeling light on or off depending on your surroundings and needs. This 2 light kit includes everything you need to start creating beautiful lighting setups. Just add a camera! It can be expanded with a variety of light modifiers and shapers by connecting to the ProMaster-S mount on each light (Bowens-S compatible). You can also add additional mReceivers (product 6719) to include other types of strobe lights and speedlights in your system. And they can all be fired from your camera by the included mTransmitter.