⭐ Specifications

Specification	Details

Model	                        Simpex 621RX
Type	                        Universal Speedlite Flash
Power	                        4 × AA batteries
Battery Type	                Alkaline / Ni-MH
Flash Output Control	8 levels / 1/8-stop increments
Flash Duration	        1/200 – 1/20,000 sec
Recycle Time	                Approx. 0.1–5 sec
Flash Count	                Approx. 100–1,500 flashes with AA alkaline batteries
Wireless	                        Built-in receiver / trigger
Flash Modes	                M, S1, S2
Wireless Channels	        16 channels
Sync	                        PC Sync socket
Head Movement	        Vertical tilt 0–90°
Compatibility	                Standard hot-shoe DSLR cameras
Weight	                        Approx. 490 g including listed package dimensions/weight

Manufacturer-confirmed battery, recycle time, flash count, output control and duration are from Simpex; additional mode/channel details are corroborated by current retailer listings.