Capable of wireless triggering via a built-in optical slave, the SF-6000 Slave Flash from Vivitar will increase your creative capabilities when lighting a subject. It offers a guide number of 130' at ISO 100 and 85mm along with a zoom range of 28-85mm for versatile coverage of a scene. The head can tilt upwards 90° and rotate 90° right and 180° left for bounce flash. Also, there is an LCD panel along with manual controls on the back of the unit for getting the exact look you want in your image. Additionally, it runs on 4 AA batteries which provide a recycle time of 5-7 seconds.