Df2etm camera uses button cell, located at the back of the fuselage, with twisted thread opening, and beside the viewfinder, you can use 50-cent coins. This screw cap should be white with a large horizontal slot in the middle, and coins or keys can be rotated and opened to enter the battery.

Shanghai Seagull Digital Camera Factory, formerly known as Shanghai Camera Factory, successfully developed China's first advanced SLR camera-Shanghai DF-7 in the early 1960s. 1968, the then Shanghai license camera was officially changed to a registered trademark of Seagull. Classic products include 58 series, 203 model, DF model, Dongfeng camera, Hongqi 20 camera, etc., and have a glorious history. However, in the late 1990s, due to the popularity of digital cameras, Seagull Camera Factory gradually declined.