Features: - RF-602/RF-603 two communication modes RF605 = RF602 + RF603 - TX/RX/TRX multiple working ways - A/B/C/D/E/F 6 groups (compatible with YN560-TX) - Wireless shutter remote control - Clear LCD screen display shortcut key operation - 16 channels - Communication range up to 100m Specification: Type: FSK 2.4GHz wireless remote control system Transmission distance: 100m Channels:16 channels Group:6 Groups (A/B/C/D/E/F ) Shutter release: half-press full-press Shutter interface: 2.5mm socket Studio flash light interface: standard PC socket Max Sync Speed: 1/320 second Battery: AAA x 2 (3V)