Description: For Dogs Different dogs may be sensible to ultrasound of different frequency bands. Please turn the knob to test different frequency bands to obtain the best results. New Version Uses ultrasonic technology which is suitable for dogs of all breeds and all sizes. The barking control device automatically emits high-pitched sounds that only dogs can hear. Durable & Waterproof-- Designed for easy hanging/mounting on a tree, wall or fence post to stop any dogs barking (within range), and so on. Warm Tips for Usage-- The dog deterrent device is not applicable to the following situations: aggressive dogs, noisy surroundings, hearing impaired dogs, dogs under 6 months or over 8 years. Great Rang 25ft-- The range of ultrasonic penetration is 25ft, covering the area indoor and outdoor. You can easily train the dog's behavior by turning on the knob. Specification: Material: ABS Size(LxWxH): 85x48.5x110mm/3.3x1.9x4.3inch Power: USB Input Voltage: 3.7V Input Current: 40mAh Battery: 3.7V 1500mAh ICR 18650NH Waterproof IP Rating: IPX4 Sensor: Sound Detection Sensor Distance: Up to 25ft Ultrasonic Frequency: 15KHZ-30KHZ How to use: Power On: Adjust the knob to level 1, level 2 or . Blue light flashing means the device has been turned on. Stand-by: The blue light blinks every 6 seconds Triggered by dog bark and start working: Red light stay on for 3 seconds. Power low: Red light starts flashing. It means the device need to be charged or it will stop working. Adjust the level of frequency by turning the knob: Level 1: 15KHZ-30KHZ,apply to large naughty dog. Level 2: 20KHZ, apply to docile dog. : 30KHZ, apply to small dog. Package Includes: 1 Piece Receiver 1 Piece USB Cable 2 Piece Mounting Screws and Anchors 1 Piece User Manual