"The Anti CockRoach Repeller Prank application works by generating Ultrasonic waves (out of audible range) that most Cockroach find repugnant. This will prevent you from getting bitten by Cockroach and other insects. The pitch of the sound is so high that most humans will not hear anything.
Only female Cockroach bite humans and animals. They are attracted by light, body odor, lactic acid, carbon dioxide and heat.
It is not 100% guaranteed but will repel most of Cockroaches biting you ."