Help stop your dog from excessive barking with this Ultrasonic Bark Stopper, an advanced wireless device that detects dog barks and emits ultrasonic sounds to teach dogs to not bark. Device has an LED working indicator light, low and high volume and works up to 20 feet away. It is harmless to dogs with no electric shock. Works for all dogs. Compact design slides into a holder with wall mount holes. Measures approximately 1.875 x 1.25 x 5 in holder. Instructions included on back of . Requires 1 9V battery not included. Comes d in a clam shell.