To improve this system, Chang has installed a transformer at both ends of a copper wire, enmeshed with the nylon net. The weak electric current is harmless to man and animals, but discourages the snails from trying to escape.
所謂蝸牛電網，就是在尼龍網上編穿兩圈細銅線，銅線兩端接上一個變壓器，通上微弱的電流，對人畜無害，蝸牛只要爬行到有電線的高度，受到電流刺激，就會從網上掉落，可有效防止蝸牛逃失。