Eventronic Watch Battery Replacement Tool Kit Eventronic watch repair kit contains a variety of functions, which can meet the different needs of replacing the watch strap, opening the back cover of the watch, replacing the battery and dismantling the parts, without spending a lot of money in the watch shop. How to open the back cover of the watch correctly? First, confirm the case type of the watch before installation, and select the correct case opener. Then, turn the watch back up and fix it on the watch back box bracket. 1.Watch with screw in case: fix the watch and adjust the center wheel to open the pin with the case diameter. When the case opener is firmly connected to the back of the watch, you can start to turn the case opener to open the case. 2.Watch with press fit case: Hold the back case opener with one hand, carefully insert the blade into the prying hole of the back cover, and then gently pry up the back cover. 3. Screw lock watch,：fix the watch, turn the screwdriver to open the cover. Note: Hold the back cover holder of the watch to prevent it from moving and scratching the watch.