Most people reach for a spray the first time they see a mouse or a cluster of bugs. That kills what is in front of you. It does nothing about what is in the walls, and you are left breathing the chemicals.

PestGuard is a plug-in ultrasonic repeller. Variable frequency, no traps, no poison. Leave it in the outlet. One unit per room is the rule of thumb.

If you have used ultrasonic units before and they failed, the usual miss is coverage — one device in a 3-bedroom house will not do it.