1. How big is it to buy, that is to say, what is the size of the largest electric drill that can be used. The bigger it is, the more expensive it is. In my personal opinion, a drill bit with a maximum size of 20mm is enough for home use. The one I bought The largest is 16mm.
2. For the same model, there are also some additional functions. For example, the model with R in the model means that the drill can be forward and reversed. This has the advantage that when you can’t drill with the forward rotation, you can use the reverse rotation to try again. Test, as far as my experience is concerned, it is still very useful. The model with E in the model means that the electric drill can adjust the speed. Of course, it is also beneficial. When you don't need such a high speed, you can use low speed operation. Of course, with these two For this function, the price will be higher, and whether to choose or not depends on your choice.
3. In the case of insufficient budget, choose moderately priced.
