in three words, small, light, powerful .This trigger executes all your picture order by frame, squall, BULB, for a reasonable price !!! I 'm very happy with this purchase. Fast delivery nothing to blame except again please in French textbooks we are France and we do not all speak Chinese or English !!!!! especially as this manual is available in French at other vendors and can be printed !!! I did it. then 5 star for product delivery and manual least 2 fault !!!