About the product1. High performance, high compatibility, high-power flash output 2. Compatible with the Canon wireless flash system 3. Call back higher rate with an external outlet 4. Support 12EPS high-speed continuous shooting under 1/16 or less brightness 5. 2.9 seconds recycle time with full output, 4-5 seconds without using new battery 6. Support high-speed continuous shooting 7. From 1/128 to 1/1, 8 stalls to lose, each stall have two fine-tuning compensation 8. Supports remote wireless trigger function, S1/S2 mode can be used in outdoor environment and the wireless trigger distance is as long as 15 meters/49 feet 9. Additional Features: PC synchronous, sniff mode, overtemperature protection and power-saving modePackage includeTR-180 Flash Speedlite for Canon DSLR Cameras Protective bag ManualSpecification: General Model TR-180 Guide No. 54 meters (ISO 100, 35mm) Zoom Range 18mm, 24mm, 28mm, 35mm, 50mm, 70mm, 85mm, 105mm, 135mm, 180mm Wireless Triggering Distance 20-30m indoor Flash Mode TTL, M, MULTI, S1, S2 Trigger Mode Wireless Slave Mode S1 S2 Vertical Rotation Angle -7 to 90 degrees Horizontal Rotation Angle 0 to 180 degrees Color Temperature 5500K Lighting Time 100-1500 times (using AA alkaline cell) Recycle Time Approximately 2.9s (AA alkaline cell used) Flash Time 1/200s~1/20000s Flash Control 8 levels of output control (1/128-1/1) External Interface Hot shoe, PC port Power Power Supply 4 x AA Battery (not included) Package Weight One Package Weight 1.04kgs / 2.29lb One Package Size 22cm * 13cm * 25cm / 8.66inch * 5.12inch * 9.84inch Qty per Carton 10 Carton Weight 15.00kgs / 33.07lb Carton Size 52cm * 44cm * 46cm / 20.47inch * 17.32inch * 18.11inch Loading Container 20GP: 253 cartons * 10 pcs = 2530 pcs40HQ: 588 cartons * 10 pcs = 5880 pcs