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Radio Slave 4i (improvements over the model 4 are as follows:)
* The range has been extended to 350 feet (110 meters)
* With the antenna down, range is up to 200 feet (60 meters)
* Hot shoe mount for the Sender. Allows unit to attach to camera shoe, sync cord is not required.
* Can also be used with provided Quantum sync cord to connect to camera sync.
* Mount to brackets, dead shoes, etc. with velcro
* Much longer battery life for Remote unit. With 4 "AA" alkaline batteries you receive up to 400 hours power. (Previously 80 hours for two 9 volt batteries). Up to 800 hours with 4 "AA" Lithium batteries.
* The Remote can also use AC power with the 515 Adaptor/Charger.
* Sync speeds: Normal Mode - 1/250 sec. Focal Plane Sync and 1/500 sec. Leaf Shutter Sync. High Speed Mode - 1/500 sec. Focal Plane Sync and 1/1000 sec. Leaf Shutter Sync. Extremely fast synchronization means Radio Slave 4i is virtually indistinguishable from "wired sync".