Monster Zapper by Bell and Howell Our pest killer uses 2,800-Volt of zapping power to stun and kill insects on contact. Narrow grills ensure that the Monster Zappers safe around pets and the hanging chain makes it ultra-versatile: use it indoors, in your kitchen and the bedroom, or outside by the porch during warm, summer nights while you enjoy some calm, alone time, or with your loved 1. The Monster Zapper exploits the physiological inclination of flying and jumping insects to move toward the nearest light source which issue to an involuntary response of the flight muscle. Because of this, to achieve best results, please follow standard guidelines below: Outdoor, Nighttime - place Monster Zapper in dark, dry area Ensure product is protected from rain or wet-weather conditions. Turn-off another light source within 20 m of the product. Daytime, Indoor - shut curtains close. Turn off other light source to attract insects towards the Monster Zapper UV-light.