Product Description Battery: 4 Aaa Batteries (Not Included) Effective Distance: 5M Material: Abs Product Size: 4.2 X 3.3 X 9.5 Cm Color: Gun Green Package Content: 1 * Ultrasonic Dog Repeller 1. [Effective Training Device] - The Ultrasonic Bark Control Device Can Not Only Prevent Dogs From Barking, But Also Tell Them Their Uncivilized Behavior. You Can Correct Unwanted Behaviors Such As Jumping, Digging, Chasing, Scavenging, And Excessive Barking. It Can Change Your Pet'S Bad Barking Habit Under The Principle Of Ultrasonic Sound. 2. [Easy To Use] - Just Press A Button To Play An Ultrasonic Sound That Can Only Be Heard By The Dog. The Frequency Of The Ultrasonic Sound Is 25 Khz For A Maximum And Effective Range Of 5 Meters. It Produces High-Pitched Ultrasonic Sound Which Is Annoying For Dogs And At The Same Time It Is Silent For Human (Audibility Is Limited To 20Khz). It Is Completely Harmless And Safe For Humans And Dogs. 3. [Convenient To Carry] - It Is Small And Lightweight And Fits Perfectly In Your Pocket, Designed For Convenient Carrying With You. Suitable For Indoor Use And For Walking The Dog Outdoors As Well. Made Of High Performance And Waterproof Abs Material. The Led Light On The Top Of The Button Can Indicate Working Status And Low Power Mode. 4. [Suitable For All Sizes Of Dogs] - The Ultrasonic Barking Deterrent For Dogs Has 2 Different Levels. Simple Button Operation, Suitable For Small, Medium And Large Dogs (From 6 Months To 8 Years Old). With A Frequency Button, You Can Adjust The Ultrasonic Frequency According To The Dogs Condition. We Recommend That You Start With The Low Voltage Unit And Then Increase The Power If Necessary.