This ultrasonic scarer device works against mice, rats and martens. It emits sound at 20-65 KHz, which works primarily against mice and rats, but can also scare away ferrets. The frequency can be changed manually so that the rodents do not get used to the sound. Place it against a wall or in a corner for best results.
It can take up to 4-6 weeks for full effect of the device.
Range: 50 m2.