To repel dogs and cats, press the side laser light button, point directly at the dog or cat, and then press the "START" button for a few seconds. The dog should be deterred from approaching by the ultrasonic sound. When necessary, press the "START" button for a longer period of time. Please keep in mind that the optimal operating range is up to 80 meters. The sonic laser animal chaser will deter most dogs and cats, but it may not work in all situations because some older animals may be hearing impaired. When approaching animals, use caution and avoid surprising them. Scram Patrol Ultrasonic Dog Repeller Chaser Stop Barking Animal Protection Laser and sonic pulsed sound combined Humane immediate deterrent At the touch of a button, it repels garden pests. Up to 80 meters of range 1 9v battery for power (not included) 9V DC output 100mA is the working current. The effective range is up to 20 feet (6M) 25KHz Ultrasonic Frequency NOTE: Requires 9v battery, not included! WARNING: POINTING DIRECTLY INTO THE EYES WILL CAUSE SERIOUS EYE DAMAGE! DO NOT USE ON OTHER ANIMALS OR FOR ANY OTHER PURPOSE THAT IS NOT RECOMMENDED. SHOULD NOT BE USED ON HUMAN BEINGS OR WITHIN ONE FOOT OF PETS. WHEN DEALING WITH POTENTIALLY DANGEROUS ANIMALS, EXERCISE CAUTION. KEEP CHILDREN AWAY FROM THE SONIC LASER ANIMAL CHASER.