YONGNUO YN660 GN66 2.4G Wireless Transmission Transceiver Master Slave Speedlite Flash for Nikon Canon Pentax DSLR Camera Compatible with YN560-TX/RF-603/RF-602/RF 603II/YN560 IV/YN560 III/RF605

Features:Support 2.4G wireless transmission, controllable distance up to 100m.High guide number of GN66, ultra fast recycle time up to 3s.Multi trigger mode: on-camera/TX/RX/S1/S2.A master control unit: realize remote control the flash mode, output and focal length of YN660,YN560IV or YN560III.A slave control unit: accept the signal transmitted from YN660,YN560IV,YN560-TX,RF605,RF605,RF603(II) and RF602, when the YN660,YN560IV and YN560-TX used as transmitter, it can realize remote flash parameter adjustment.Supports 16 channels and 6 groups.Support electric zooming function, sound prompt, automatically saving setting, power saving mode, over-heat protection.Specifications:Curcuit Design: IGBTGuide No.: 66(ISO 100, 199)Flash Mode: M/MultiTrigger Mode: Camera set-top/TX/RX/S1/S2Zoom Range: 20mm/24mm/28mm/35mm/50mm/70mm/80mm/105mm/135mm/199mm(199mm is equivalent to 200mm focal length)Vertical Rotation Angle: -7-90 degreesHorizontal Rotation Angle: 0-270 degreesPower Supply: 4 * AA(Not included.)Lighting Times: 100-1500 timesRecycle Time: Approx.3sColor Temperature: 5600KFlash Control: 8 levels of output control(1/128-1/1), 29 levels of fine tuningExternal Interface: Hot shoe, PC port, External charging portWireless Triggering Distance: Optical--20-25m(indoors)/10-15m(outdoors) 2.4G--100m Additional Features: electric zooming function, sound prompt, automatically saving setting, power saving mode, over-heat protection, advanced options settingItem Size: 21 * 6.5 * 5cm / 8.3 * 2.6 * 2.0inItem Weight: 427g / 15.2ozPackage Size: 22 * 10 * 9cm / 8.7 * 3.9 * 3.5inPackage Weight: 613g / 21.6ozNote:The batteries are not included.