The new RF-603 II is improved version of RF-603, it is a remote shutter release as well as a multi-functional radio flash trigger which can synchronously trigger flashes and studio strobes. Through the transceiver based system each item can be used flexibly as trigger or receiver. Only 2 AAA batteries are required as power source for each item. Improved Features: 1. Hot shoe locking system to prevent from slipping off 2. Switch on side for easy operation 3. Enhanced self-detecting system Specification (each item) Specification (each item) Type: FSK 2.4GHz wireless remote system Transmitter Distance: 100m Release: Half-way press, full-way press Transmitter Port: PC Sync Receiver Port: PC Sync, 2.5mm for shutter release Receiver stand-by time: Up to 45 hours (using AAA batteries) Dimensions: 37mm x 30mm x 81.5mm Weight: 150g Compatible Cameras Nikon D90 D5000 D5100 D7000 D3100 D5300 D7100 D610 Compatible Flashes£º Nearly all flashes with a standard hot shoe and being released by the middle contact are compatible Please note that the RF-603 only supports the manual flash mode, not TTL, but it works with TTL flashes Supports the "sleep mode" or "wake up" mode which some flashes are equipped with Canon 580EX II, 580EX, 540EZ, 520EZ, 430EZ, 430EX, 420EX, 420EZ, 380EX Nikon SB-900, SB-800, SB-28, SB-27, SB-26, SB-25, SB-24 Not compatible with Nikon SB-600 Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FT Fuji Film S3Pro / S5pro Sigma EF-500 DG Super, EF-500 DG ST, EF-430 Yongnuo YN460, YN462, YN465, YN467, YN468, YN560 Not compatible to Sony/Minolta flashes Packaged come with: 2 x Transceivers 1 x Shutter release cable (N3) 1 x User manual