Built-In Wireless X System Receiver\nHSS: 1/8000 sec, Battery: 500 FP Flashes\nOptional X1 Wireless TTL Transmitter\nSupports Nikon, Canon, Sony TTL\nSupports Olympus, FUJIFILM TTL\nFlash Exposure Compensation\nTTL, Manual, and Stroboscopic Modes\nFirmware USB Updates, 1 x Carry Case