Compatible Models: Canon / Nikon / Olympus / Pentax Digital Single Lens Reflex; LED Quantity: 1; Color Temperature: 5500K; Power Supply: 4 x AA alkaline / Ni-Mh batteries (not included); Working Voltage: 6V; Power: 10W; Guide number: 56 (ISO100 180mm); Flash mode: M.Multi.Slave; Trigger mode: Sc Sn S1 S2; Zoom range: 18 / 24 / 28 / 35 / 50 / 70 / 80 / 105 / 135 / 180mm; Vertical rotation angle: -7~90 degree; Horizontal rotation angle: 0~270 degree; Supports 2.4GHz ultra-range wireless flash the farthest triggering distance is up to 100 meters; The same TR961 can receive the signals sent by wireless transmitters easy to realize wireless flash; Large-size LCD display: The TR961 is equipped with large-size LCD screen easy clear intuitive view or set the flash of the function and easy to use; Equipped with power zoom function: Zoom button lamp cover focal length can be altered within 18~180mm by pressing (Zoom) button; GN56 @ ISO100 180mm: High index 2.4G radio flash support M / Multi mode; A variety of trigger synchronization flexible and changeable The TR961 provides can be trigged through the camera set-up 2.4GHz radio S1 and S2 preflashing; TR961 provides charging socket for external power pack to meet your higher demand for charging recycle; Supports PC port TR961 provides PC port you can make the flash synchronously by connection to the PC port; Sound prompting system when the sound prompting system is enabled the different sound ways will prompt the different working conditions of the speedlite so as to make you focus on shooting only; Super speed of changing recycle: It only takes 2.9 seconds in changing after full power output; Even without new batteries you can get the super changing speed that it only needs 4~5 seconds; In addition you can use the external power pack to accelerate the changing speed once more; Advanced option functions: TR961 has advanced options setting function where you can self-define the functions of the speedlite on your own requirement; TR961 can automatically save your current setting; Metal hot shoe stand durable Compatible Brand: Canon Nikon Pentax Olympus DSLR etc.