4 Pack Upgrade Pest Repeller Plug-in Pest Control Reject Anti Mice, Mosquitos, Insects, Bugs, Ants, Spiders, Roaches, Rodents, Rats for Indoor use Features: Each set includes 4 small units, each pest control repeller covers up to 120—150m2.  JUST PLUG IN. Just plug our pest repeller into the socket and let it do the rest. It should be vertical to the floor and plug to the outlet. Since the sound can not penetrate wall and solid object, one room one unit is recommended. As for large storage area with serious pest infestation, additional units is required. This pest repeller is Odorless, noiseless and no radiation. Pest control uses sound waves to drive pest and rats away Specifications: Operating voltage: AC 180v-250v / 50Hz; AC 90-110V/60HZ Power: 6-8W Output frequency: 25kHz - 55KHz Effective coverage: 120-150m2 (open space) Overall dimension: 100 * 65 * 58 (mm) Package size:135*125*65（mm) Pacakge weight:255g Matters Needing Attention: 1.The machine should be installed 20-80 cm above the ground, and should be inserted into the power socket perpendicular to the ground; 2. The installation point should avoid the carpet, curtain and other sound-absorbing materials as far as possible, so as to prevent the decrease of sound pressure from reducing the sound field and affecting the insect repellent effect; 3. In the first few days of use, it is normal to find that the activities of rats and pests increase significantly. After being attacked by ultrasonic wave and electromagnetic wave, the rats and insects hiding in the nest escape from their hiding places one after another; 4. The machine is directly inserted into the AC mains socket for use (voltage range: AC90V ~ 250V, frequency: 50Hz ~ 60Hz); 5. Attention: moistureproof and waterproof; 6. Do not use strong solvent, water or wet cloth to clean the fuselage. Please use dry soft cloth dipped in some neutral detergent to clean the fuselage; 7. Do not drop the machine or subject it to strong impact; 8. Ambient temperature: 0 ~ 40 ℃; 9. If it is placed in the warehouse, goods stacking place, or multi room floor, more local machines should be placed to increase the effect. 10. At present, the effect of similar products is less than 100% Packing list: 4*Pest Repeller