Electronic Flash Flashgun Speedlite Speed light for Nikon D90 D80 D70s D60 D50 D40 D3 D5000 D3000 D1000 D700 D300 (YN560) New Power zoom function: You can push the button on the flash and make it covered focal length range from 24mm to 105mm. Guide number: 58 at ISO100, 105MM Slave function ( S1, S2 mode): You just can use YN-460 and YN-460 II in indoor and at a very weak light, For YN-560, you can use it in outdoor environment, and the wireless triggering distance is as around 15m. New Charging socket for external power pack. Sound Indicator: When the charging process is finished, the flash will give a tich sound, so you may concentrate on the creation process.