1.can be used as shutter release 2. 1/250s sync speed 3.Maximum Working Distance: 100m BRAND NEW WANSEN WS-602 2.4GHz Wireless Remote Flash Trigger for CANON Laser the same as YN RF-602 

WANSEN WS-602 is using FSK 2.4GHz wireless frequency, suitable to use this free channel in many countries; guarantee 8f the transfer speed, distance and stability. It is available to purchase the RF-602 for using multi-receivers at the same time,When using the RF-602 reserved to "Canon" or "Nikon" to control the flash light, the flash sync speed is up to l/250s, and 100 meters.  Features

    Using global free 2.4GHz channel and FSK modulation system, and there's 15 selectabh frequency channels.     Flash sync speed is up to 1/250s.     Support the flashgun wake-up function; you'll never miss any shot opportunity.     (Wake up can only used in TTL Compatible flash)     Fire the flashgun through hot shoe part and fire the studio light through PC socket     Supports to control multiple flashguns and studio lights at same time.     Supports to control multiple cameras to take shots at the same time.     Maximum operating distance is up to 100 meters.

FunctionsType: FSK 2.4GHz wireless remote systemOperation distance: 100 metersChannel: 16 difference channels and ALL channelsRelease: Half-way press, Full-way pressTransmitter terminal: 3.5mm input terminalReceiver terminal: 3.5mm output terminalTransmitter standby time: Up to 20000 times (using CR2 lithium battery)Receiver standby time: Up to 45 hours (using AAA battery)Dimensions ( H x W x D):    Transmitter: 40.0mm X 48.5mm X 28mmReceiver:   35.0mmX80.0mmX26.0mmWeight: Transmitter: 36g (with battery)Receiver: 55 g (with battery)