This product is mainly used for outdoor environment to prevent undesired dog attacks. Just one push of button, the unit emits an ultrasound to a dog's hearing.
Key features and specifications:

• Emits 130 dB of ultrasound to a dog's hearing.
• Unit has a flash light function.
• Two excitation pattern to train or to repel a dog.
• Powered by 1 x DC9V battery (not included).