Bug zappers can actually be used indoors - in fact, that's considered one of their main uses. Chemical bug zappers, which lure bugs with dangerous chemicals, are generally used outdoors to minimize contact with youngsters or pets. However, Zap Zone Defender System bug zappers that attract insects with ultraviolet light draw little electricity, are pretty inconspicuous (other than the electric crackle when a bug is zapped), and can be used indoors or outdoors. Some appear to be lanterns, some resemble little heaters, some run on batteries, and a few might be plugged right into a wall outlet. Some zappers include a removable tray that catches the remnants of zapped bugs