I have long searched for a good flashlight, A Canon was too expensive. By customer reviews I found the Neewer PRO NW670 E-TTL. The price is unbeatable. Did not expect much of me. But I am pleasantly surprised. The delivery is fast, like Amazon usual. Well packed. Batteries are not included. The device with a professional look and works the same way. The description, although only in English. But some English but everyone has learned times. Even without description, the operation is very simple. Just think logically. If you do not use the remote control, it is easy anyway. you just have to find out the strength of the flash for the subject. By using the remote control you have each set the same channel on the transmitter and receiver. The flash is also available as a slave. I have the remote triggering tried to 20m, triggers. The remote control is working properly, with the right, supplied cable remote control of the camera is possible even without a flash. Just connect the receiver with the camera to connect. For "Bulb" you have to keep the first 5 sec the start button on the transmitter is pressed, then on reaching the exposure of course again, press (OFF). A strong buy recommendation.