SK Telecom Co. said subscribers can pay 3,000 won to download a sound wave that is inaudible to human ears but annoys mosquitoes within a range of three feet.

• 韩国鲜京电讯公司表示，定制此项服务的用户只需花3000韩元便可下载一种声波。这种声波可以在3英尺的范围内驱赶蚊虫，而人耳却听不见。