This product is designed like an alarm clock. The luxurious outdoor ultrasonic anti-barking device can be hung on a tree, placed anywhere in the house or yard. It can be hung, placed on a table or other places. When the anti-barking device detects excessive barking, the microphone detects the barking and activates the device. It then emits a safe high-frequency ultrasound that the dog can hear but not humans. The sound stimulates the dog and makes it stop barking. Excessive barking can affect you and your neighbors. This outdoor ultrasonic anti-barking device effectively stops dog barking without the need for a receiver collar. Safe and effective, suitable for all breeds and sizes.K6 Digital Outdoor Ultrasonic Anti-Barking DeviceDigital display & rechargeableFour frequency settings: Choose according to different pets, animal types or size.Seven sensitivity levels: 1-4 levels with digital display, where level 4 is the most sensitive. The display shows the current status.UV-resistant casing: The product does not easily fade from the sun's UV radiation.IP4 waterproofSpecificationsWeight: 0.2 kg / setDimensions: 12.5 cm × 9 cm × 5 cm