Features: Versatile Lighting Controls: A dual-flash-tube design with a separate brightness control system, it allows you to either fire both tubes simultaneously, or each at a time, adjusted from full power to 1/128 at 1/3 stop increments to create light to dark ratio, achieving uniform lighting of your subject when taking high sensitive photos. Focus on High Efficiency: A couple of focus assist lamps in 10 levels of power ratio helps to make focusing and composition easier in low light, which ensures you to create in highest efficiency. Universal Compatibility: Including several adapter rings, the macro ring light has a high compatibility with lens of diameters: 49mm/52mm/55mm/58mm/62mm/67mm/72mm/77mm. In addition, the controller unit with a hot shoe is compatible with most DSLR cameras on the market. Stable and Reliable Performance: Having a powerful rechargeable lithium battery, the macro ring flash light is capable of delivering 660 flash times in full power, which ensures you long time usage in total confidence. And battery charger is included. Tame It in One Flash: A user-friendly interface in a large LCD screen will immediately tell you the output power, the current mode, the battery level and so on. With a few buttons below on the controller, you would learn to use it within a one-flash-time. Specifications: Guide No.: GN14/46(ISO100, in meter/feet) Battery Capacity: 7.2V 2600mAh Flash Power(1/1 power output): 76Ws Focus Assist Beam Power: 0.7W * 2 Color Temperature: 5000K Flash Power Range: 1/1-1/128(with 1/3 increment at each stop) Flash Duration: 1/300s-1/20000s Inner Diameter of Light Body: 77mm Illuminating Distance: 3cm-1.5cm Recycle Time: 0.1-1.5s Full Power Flashes: 660 times Working Environment Temperature: -10 to 50 Ring Flash Size: 13 * 2.7cm/ 5.1 * 1inch Controller Size: 12 * 7 * 5cm/ 4.7 * 2.7 * 1.9inch Net Weight: 577g/ 20.3oz (with battery) Packing List: 1 * Macro Flash 8 * Adapter Rings 1 * Lithium Battery 1 * USB Charger 1 * USB Charging Cable