The DOG CARE Barking Control Devices are a rechargeable, 2-in-1 device that is perfect for stopping unwanted dog behavior. With two modes, this device is perfect for various scenarios. The Deterrent mode emits a higher intensity ultrasonic sound along with a LED strobe light. This mode is ideal for stopping excessive barking, digging, or fighting. The Training mode emits a lower frequency sonic to help you with daily dog training. These devices are built in with a 2000mAH lithium battery. They have a standby time of up to 6 months, and can support up to 4 months of use if you charge them daily.