Features: Ultrasonic Design - Ultrasonic wave reaches up to 130db. Audible to dogs but not to humans. Effectively target animals up to 20m away. Can also be used as a dog training device. stop some unwanted behaviors, and protect yourself from being attacked by unfriended dogs. Multifunctional - The dog repeller has 3 functions, the first one is the LED light function, the second one can train your dogs with low-intensity ultrasonic, and the last one is an anti-barking function which depends on intense ultrasonic; Fit for training most kinds of dogs and pets. Safe - If you are walking, jogging, or bicycling, and you encounter a dog that tries to attack you, you can use it and press the button to the "Chaser", then it will launch ultrasonic waves to the barking dog. So it can keep unfriendly dogs away and protect you from dangerous Easy To Carry - This product is small in size and easy to carry. keep unfriendly dogs away; protect yourself from dangerous dogs while walking, or jogging and the bright LED flashlight is helpful for nighttime activities, It is useful for your daily life. Convenience - you need to open the battery cover first and then put 1 piece 9V battery (not included), the sound is audible only to pets, and finally turn on the switch. and it can train dogs or keep you away from unfriendly dogs. Can work with most dogs. Specifications: Dog Repeller Material: ABS Plastic Colour: Yellow/Black Size (W x L x H): 13cm x 4cm x 2.6cm (approx) Mode: 3 Modes Package: 1x Dog Training Repeller NOTES: Please allow a 1-3 cm difference due to manual measurements. Please note that a slight colour difference should be acceptable due to the light and screen.