Subtronics India Pvt. Ltd. Manufactures Ultrasonic Pest Repeller, bearing the model SUB- 404. Subtronics India Pvt. Ltd. Is an ISO 9001:2000 certified company. Subtronics India Pvt. Ltd. Is an ISO 9001:2000 certified company. Ultrasonic Pest Repeller works on Ultrasonic principle by transmitting ultrasonic waves, which are above 20 KHz. These waves are not audible to human beings but they cause a severe nervous discomfort in the pests, resulting to be repelled. The unobstructed closed area of 300 square feet gets absolutely pest-free. Ultrasonic Pest Repeller works on 240 volts A.C. The `TEST` switch of this machine is specially designed to give an audible tone along with the green - LED Signal that indicate that the pest repeller is in the working mode and starts radiating ultrasonic waves in the form of pulses, thus keeping all the unwanted pests away. Ultrasonic Pest Repeller is used in showrooms, factories, homes, offices, kitchens, restaurants and lobbies.