FOTOWELT 9.5CM Windshield & Dash Car Suction Cup Mount + 1/4" Steel Thread Tripod Mount + Nut For Gopro Hero 4 3+ 3 2 1 it has two communication modes RF-602 and RF-603, so you can use RF-605, RF-603 II, RF-602 together. ( but you can't use them in group function together ) it has TX (single transmit) / RX ( single receiver ) / TRX (transmit-receive automatic switch), so you can not only use it as transmitter but also as receiver. it has A/B/C/D/E/F 6 groups ( compatible with YN560-TX ) it has wireless shutter remote control, wireless Flash trigger function. it has Clear LCD screen, shortcut key operation,16 channels ( FSK 2.4GHz wireless channel )