With central hot shoe contact, sync cable connection and slave function, this small unit is suitable for use as a main flash for Non TTL cameras, and for wireless automatic 'servo flash' operation. It can also be used in conjunction with a Controller flash (through wireless TTL flash control) as a TTL slave flash. Due to its photo-sensor and a special time-lag function the 34 CS-2 digital is ideally suited for many digital cameras, even models without a flash connecting facility or featuring a monitor pre-flash.