Yongnuo flash speedlite, just connect to one transceiver of Yongnuo RF-602, RF-603, RF-603 II. it's not just be used as flash controller, can also be a remote controller, since YN560-TX transmitter unit providing remote manual power control and zoom setting for the popular inexpensive YN-560 III manual flash units. Together with RF-602/3 triggers: it is a wireless trigger with 6 groups (A, B, C, D, E, F, G) and 16 channels; Zoom range: 24-105m ; Shutter Interface: 2.5mm shutter ; Compatible with: YN-560 III, RF-602, RF-603, RF-603 II and All cameras with standard hot shoe
Battery Type: 2xAA (not included)
Stand-by time: 120hours

Details for YN 560III
Recycling time: 3s(full charge), 4-5s (not new battery) Working Power:4xAA Alkaline batteriesCarbose Industrial limited