The YN560-IV Speedlite is a long range flash unit that features both a 2.4 GHz wireless radio transmitter and receiver. It is capable of triggering other flashes from up to 328' away as well as being triggered with the RF-603 and RF-602 wireless transmitters. It's guide number is 190' at ISO 100 and 105mm and has a zoom range of 24-105mm, which is able to be expanded to 18mm with the built-in wide-angle diffuser. Additionally, this output can be adjusted from 1/1 to 1/128 power.
In adiition, full bounce and swivel lighting is possible due to -7 to 90° tilt and 270° of rotation with the locking flash head. The flash can also be triggered optically with either instant sync or skip pre-flash options. It has a recycle time of about three seconds.