● Power ON/OFF, switching between TTL and manual, TTL and TTL exposure compensation (from +2 to - 2 with in 1/3 increments) are controlled from the housing. ● Accessory connector (supplied with the converter) is fixed in the accessory port. ● LED showing battery charge remaining is situated alongside the viewfinder on the rear of the housing. ● 4 mode strobe selection switches (for Left and Right) are located inside the housing. ● Battery box (for CR2 lithium battery) is situated inside the housing. Compatible strobes: YS-D1, YS-110Alpha, YS-110, YS-250, YS-120 and YS-60/90. Accessory: CR2 lithium battery. * 5-pin Sync Cord/N #17100 is required.