Control without barking, inside and outside ultrasonic dog barking stop device, black Description: Safe for dogs - Different dogs may be sensitive to different frequency bands. Rotate the knob to test different frequency bands for best results. New Version - Uses technology that is suitable for dogs of all breeds and sizes. The control device automatically emits high sounds that only dogs can hear. Durable and waterproof-designed for easy hanging/mounting on a tree, wall or fence post to keep any dogs (within reach) and so on. Warm tips for use-dog repellent device is not applicable in the following situations: aggressive dogs, noisy environment, dogs with hearing impairment, dogs under 6 months or years. Great Rang 25ft--The range is 25ft, covering the indoor and outdoor area. You can easily train your dog’s behavior by turning the knob. Specification: Material: ABS Size (L. x W x H ): 85x48,5x110mm/3,3x1,9x4,3 inch Power Supply: USB Input Voltage: 3,7 V Input Current: 40 mAh Battery: 3,7V 1500mAh ICR 18650NH Waterproof IP rating: IPX4 Sensor: sound detection Sensor Distance: Up to 25 feet Frequency: 15KHZ-30KHZ How to use: Turn on: Set the knob to , level 2 or . A flashing blue light means that the device has been turned on. Standby mode: blue light flashes for a few seconds Triggered by the dog and starting work: red on for 3 seconds. Low power: The red light starts flashing. This means that the device must be charged or stop working. Adjust the frequency level by turning the knob: : 15 KHZ-30 KHZ, applies to large naughty dog. Level 2: 20 KHZ, applies to obedient dog. : 30 KHZ, applies to small dog. The package includes: 1 piece receiver 1 piece USB cable 2-piece mounting screws and anchors 1-part instruction manual