The button that looks like a woman calls your mom's cell. The button that looks like a man calls your dad's cell. The other ones. . . i have know idea. Go to fireflycell.com to find out more. Bye Oh and i think they are useful.
There is no documentation of lightning bugs eating mosquitoes, but it may be possible. Firefly larvae are predatory and can eat small animals like slugs and earthworms. Adult fireflies are generally herbivorous, but in some species adults are predatory like their larval counterparts.