A complete wireless handy flash unit,FlashQ Q20II, is a full featured GN20 flash with detachable radio transmitter, LED lighting, flash head tilting and built-in gel holder. It is convenience to charge Q20II with standard USB power sources, e.g. computer port or USB adapter. Just make certain to use rechargeable Ni-MH batteries on Q20II flash body.Technical Specifications:Guide Number 66ft (at ISO 100)Focal length coverage: 32mm (Full-Frame)Manual flash power ratio control (7 steps adjustable, 1/64 to 1/1)LED video light (7 steps adjustable, Max. 60 lux output at 1m)2.4GHz low-power digital radio (FlashQ Receiver) inside Q20II main body32ft wireless operating rangeTilt-capable flash head, up to 90° and with click-stops at 0°, 45°, 60°, 75°, 90°Other functions: S1 / S2 optical slave, modeling light (LED)Transmitter per charge : 80 hours operation and 120 days standbyTwo AA-size alkaline / rechargable Ni-MH batteries for Q20II main bodyRecycling time (1/1 full power output) : 7 sec. by fresh alkaline batteries / 6 sec. by Ni-MH batteriesNumber of flashes : 100 - 2000 flashes by fresh alkaline batteriesLED lighting time: approx. 1 hour (at full power LED output and by Ni-MH batteries)Flash color temperature : 5600K±200K (same as daylight)LED color temperature : 5500K±300K , CRI 95Dedicated socket for FlashQ transmitter attachmentDimensions : 2.3(W) x 3.9(H) x 1.1(D) inches (with FlashQ Transmitter attached) Weight : 4oz (without battery)Package Contents:1 x FlashQ Q20II (BLACK) with detachable T2 Transmitter1 x Color gel pack (6 colors)1 x Protective pouch1 x USB charging cable1 x User manual * AA batteries is not included. T2 Transmitter with built-in Li-ion battery, rechargeable.