Bug zappers can actually be used indoors - in reality, that's certainly one of their foremost uses. Chemical bug zappers, which lure bugs with harmful chemicals, are usually used outdoors to minimize contact with kids or pets. However, bug zappers that attract insects with ultraviolet light draw little electricity, are fairly inconspicuous (other than the electric crackle when a bug is zapped), and can be used indoors or outdoors. Some look like lanterns, some resemble little heaters, some run on batteries, and a few will be plugged into a wall outlet. Some zappers come with a removable tray that catches the remnants of zapped bugs