The PROMASTER UNPLUGGED m400 MONOLIGHT is a high-powered, wireless strobe that gives you the freedom to light a subject just about anywhere. It includes a wireless transmitter for your camera that can fire the light's built-in receiver from up to 300' on one of 16 channels. The included reflector can quickly be removed allowing you to connect a variety of ligtht modifiers and shapers via the ProMaster-S mount (Bowens-S compatible). Or you can choose a photographic umbrella with or without a reflector attached. A snap-on diffuser is also included so you can soften the light coming through the reflector. 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. If you decide to run the m400 on AC power in a studio setting, an optional AC Adapter Kit is available for purchase (product 6852). You can expand on the m400's wireless firing system by addig Unplugged mReceivers (product 6719) to fire other types of strobe lights and speedlights too!