Pest Master - 4 x Ultrasonic Pest Repeller, Powerful Mouse Repellent - Wide Frequency Range Pest Control Device and Ideal for Mice, Rats, Mosquitoes, Cockroach, Moths, Ants - D4

The machines are very easy to work - put them in a plug socket, turn it on and they're good to go

They do not do anything like what it says and that mskes me suspect ive been sold "a pig in a poke " ive sat with the plug in plugged into the electric right nxt to me and watched the cat fleas land on me nout happened