Phottix Strato II Multi 5-IN-1 Trigger Set for Canon -PH15651 Bundle With Additional Receiver and Microfiber Cloth Phottix Strato II Multi 5-IN-1 Trigger Set for Canon -PH15651 Phottix Strato II Multi 5-in-1 Receiver for Canon. 4 Channels AAA Batteries 2.4 GHz