Big Cheese Anti Mouse Mini-Sonic Mouse Repellent 3 PackThe Big Cheese Anti Mouse Mini Sonic Repellents 3 Pack are the next generation of ultrasonic rodent deterrents. The discreet units are smaller so when plugged in they dont obstruct the neighbouring socket. Despite the smaller size, they still remain fully effective in humanely deterring rodents. The repellents are easy to set up and use and dont require any batteries. Simply plug the units into an electrical socket and switch on. Use one repellent