to upgrade the flash.Large-size LCD Negative Display Screen: It is convenient for you to view or set various functions of the flash clearly and intuitively.Specifications:Brand: YONGNUOModel: YN650EX-RFCircuit Design: Insulated Gate Bipolar Translator(IGBT)Guide Number: 60(ISO 100, 200mm)Flash Mode: ETTL, M, Multi, GrTrigger Mode: Set-top, radio master, radio slave, wireless optical master, wireless optical slave(Sc, S1, S2)Channel: 16Lamp Holder Zoom Range: 28, 35, 50, 70, 80, 105, 135, 200mmAdjustable Angle: -7~90°(vertical), 0~360°(horizontal)Power Supply: 4 * AA alkaline batteries or AA nickle-metal hydride(Ni-MH) batteriesLight-emitting Times: 100~1500 times(using AA alkaline batteries)Color Temperature: 5600KSync Mode: High speed 1/8000s sync, rear curtain syncFlash Time: 1/200s~1/20000sRecycling Time: 2sFlash Control: 8 levels of brightness control(1/128~1/1), a total of 22 levels of fine adjustmentLED Modeling Lamp Power: 2WLED Modeling Lamp Beads: 24pcsLED Modeling Lamp Color Temperature: About 5600KExternal Interface: Hot shoe, PC interface, external charging interface, USB interfaceRadio Transmission Trigger Distance: Up to 100 metersOptical Transmission Trigger Distance: 20~25 meters indoor, 10~15 meter outdoorAdditional Functions: Master flash, off-camera flash, exposure compensation, exposure bracketing, exposure lock, lamp bead electric zoom, voice prompts, automatic save settings, power saving mode, overhead protection, custom funcitons, firmware upgradeItem Size: 20.4 * 6.5 * 7.8cm / 8.03 * 2.56 * 3.07inNet Weight: 430g / 15.17ozPackage Size: 22 * 10 * 9cm / 8.66 * 3.94 * 3.54inPackage Weight: 600g / 21.16ozPacking List:1 * Speedlight1 * Carrying Bag1 * Mount Base1 * User Manual