【實用工具app】Dog Repeller|最夯免費app-綠色工廠好玩App

Protect yourself from dangerous dogs while cycling or walking or jogging with the ultrasonic Dog Repeller. It produces a high frequency sound that the human ear can not detect yet it is able to deter vicious dogs without harming them.A must-have for every mailman!Now with adjustable frequency__________________________________For best results use an iPhone 4 ornewest generation iPod and set system volume to maximum