Smart watch is not only a health device for recording sports data, you can also give it more functions. At present, there are many applications that can turn a watch into a shutter button. With ulanzi’s st-09 expansion clip, you can turn an apple watch into a small viewfinder for your iPhone. < / P > < p > with this expansion clip, you can fix the apple watch to the back of the iPhone, and then turn it into a small viewfinder for the iPhone through the supporting Apple watch app. This expansion clip is very useful when you take a self portrait with the iPhone’s rear camera. < / P > < p > at present, the retail price of this expansion clip on Jingdong is 59 yuan. The expansion clip also supports the connection of fill light, microphone and other accessories through the cold boot mouth. The bottom 1 / 4 screw hole design can expand the tripod, handheld handle and other devices. The iPhone 12 keynote has been recorded in Apple park