Reliable, without chemicals, with environmentally friendly voltage supply. Drive off rodents with vibrations - now possible for nature lovers too! The troublesome rodents are combated by quartz vibrations instead of poisonous chemicals or deadly live traps. Just stick the appliance in the ground. You bother neither the environment nor your conscience and other useful animals are not affected. The use of high quality electronic components and perfect circuitry provides for an environmentally friendly and inexpensive voltage supply for approx 6 months of constant use. The conventional, commercially available appliances mostly require 4 expensive mono cells for similar performance