Bug zappers can certainly be used indoors - in fact, that's one of their main uses. Chemical bug zappers, which lure bugs with harmful chemicals, are generally used outdoors to minimize contact with children or pets. However, bug zappers that attract insects with ultraviolet light draw little electricity, are fairly inconspicuous (aside from 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 some can be plugged into a wall outlet. Some zappers come with a removable tray that catches the remnants of zapped bugs; you should just empty this into the garbage now and then. Other bug zapping devices include handheld bug zappers, which look like plastic tennis racquets.
You can take these with you on a hike and use them indoors, as well. You may enjoy using it at night before retiring to make a ... more.
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