Keep eight-legged creepy crawlies at bay with powerful ionic, electro-vibrawave and ultrasonic technology. Effective in up to 500sq ft of open space, this plug-in spider repeller emits sounds spiders hate, but humans, dogs and cats can’t hear. Safe around all your household electronics, there’s also a handy, built-in automatic nightlight. Simply plug it in and turn on. For optimum use, do not place behind heavy furniture. Not safe around pet rodents or tarantulas. H12.5 xW7 xD7cm.