This indoor device can help safely control your dog's barking up to 8 metres away. Whenever your dog barks a 2 second ultrasonic correction tone is delivered either automatically. 

• Twin pack allows for extra coverage. 
• No collar necessary
• Emits an ultrasonic sound only your dog can hear
• Automatically deters
• Microphone activated
• For dogs of all sizes and breeds
• Runs on 4 x 3volt lithium batteries (included)
• Dimensions: width 4cm x depth 3cm x height 7cm