TheNissin i40 Flashis a shoe-mounted, compact flash unit designed for Sony cameras with a Multi-Interface Shoe featuring ADI / P-TTL functionality. It features a guide number of 131' at ISO 100 and in the 105mm position for providing excellent coverage within a zoom range of 24 to 105mm, or down to 16mm with the built-in wide-angle diffuser. Also, this unit features an LED light suited for video work with 9 output levels.For control of the light during use, the flash head is able to tilt upwards 90 and can rotate 180 in both directions, giving you complete 360 coverage. There is also wireless TTL functionality which will allow you to implement this flash off-camera in combination with other units.The i40 features full manual control and a range of modes for getting the look you desire from your lighting. These include slow-speed, high-speed, 1st and 2nd curtain synchronization in addition to variable power from 1/1 to 1/256. The flash runs on 4 AA batteries and includes an external diffuser, soft case, and stand.Guide number at ISO 100 of 131' at 105mm and 89' at 35mm positionRecycle time of 0.1 to 4 secondsApproximately 220 to 1700 flashes on a single set of fully-charged batteriesLED run time of about 3.5 hours with new batteriesColor temperature of 5600KWireless slave ADI / P-TTL functionalityExposure compensation from -2 to +2 EV in 1/2 step incrementsAF assist beam with range of 2.3 to 16.4'Flash duration of 1/800 to 1/20,000 secondRed-eye reduction modesTwo selector dials on the back of the flash for changing modes and adjusting power settingsLED light has 9 steps of output levels