I have a lot of favourite electronic gadgets， one of which is a video MP3. As well as carrying my favourite music， a video MP3 player can play up to 150 hours of movies and TV programmes. However, it cost me 2，000 yuan. Besides, the loud volume will damage my hearing if I overuse it.
If I want to buy a necessary electronical gadget, the first factor that should be taken into consideration is whether it’s practical.