The Profoto D1 Air 250 watt second Monolight is a significant refinement of the ComPact monolight series from the company which having become synonymous with professional strobe lighting, is now celebrating its 40th anniversary. This D1 Air 250 w/s 2-Light Studio Kit includes 2 D1 Air 250 monolights, 2-D1 Small White Umbrellas, 2-D1 Light Stands, 1-D1 Studio Kit Case and a Profoto Air Remote. No stone has been left unturned in the provision of tech and convenience features that seem to derive from professional photographers feet wish lists. The sleek matte-black, high-impact polycarbonate finish encases strobe design that goes beyond the highly visible LED readout and is digital from the ground up. The 7 stop power range breaks down to 1/10 stop increments providing flexibility, precision and consistency, made possible by dual mode SMPS capacitor charging. A new built-in 77 degree reflector (5.12" diameter) maximizes case space and is ideal for umbrella and softbox use. Features that we feetve come to expect from Profoto over the years: short flash duration, rapid recycling, a bright 300W modeling lamp and heavy-duty cabling are all on-board. New Profoto Air System technology replaces the sync cord, allowing the head to be remotely triggered from as much as 300 meters (1000 feet) away using a Profoto Air Remote (included with kit) or Air Sync transceiver (sold separately). The Air Sync provides wireless triggering (8 channels) via hot shoe or mini plug, while the Air Remote provides wireless triggering as well as full-function head control over 8 channels in 6 distinct groups. Additionally, the D1 Air feets syncing and complete functionality can be wirelessly controlled via your PC or Mac by using Profoto feets Air USB and Studio Air systems. Modeling lamp operation is user-selectable: On/Off/Proportional and Free (manual). There is also a selectable flash confirmation (dimming) feature in addition to an audible, fully-recycled tone.