... can fire Canon TTL flashes wireless without using a master flash. Ultra-AF Access to Camera Menu Support Exposure ... 550EX, 430EX, 430EX II, 580EX, 580EX IISpecifications:Type: On-camera, speedlite transmitterChannel: 4Transmission range: up to 25mTransmission angle: 40° ... 2min., power off after 15min. idle stateAdditional functions: Rotatable, Camera menu controlable, FEC, FEBDimensions: app. 63 x 63 ...