Used only a few times. Like new. Compact and easy to use. It worked for my two dogs! [New Release! Dual Ultrasonic Ports & Added Wideband Frequency] Compatible with all dog breeds, this is a 100% safe ultrasonic handheld dog bark deterrent training device. This product is equipped with two ultrasonic emission ports, making it the most powerful and versatile on the market. While 25kHz ultrasonic waves are effective for most dogs, the 10% of dogs that are "difficult to train" tend to gradually ignore this sound. Therefore, based on research on dog hearing, we have added a rapidly fluctuating pattern of 23-30kHz waves to prevent the dog's auditory system (and brain) from blocking out the sound. This is expected to improve various problem behaviors such as excessive barking, biting, destructive behavior, digging, chasing, running away, and even the ingestion of dangerous objects. [3 Operation Mode Switching & Ultrasonic Intensity Level Adjustment] You can choose from 3 modes: Ultrasonic mode (adjustable intensity levels 1-3 / switch with the L button), Ultrasonic + Flashlight simultaneous operation mode (ultrasonic + strong vibration + flashing light combined effect), and Flashlight only mode. Remote operation is possible up to 15m. You can immediately address various problem behaviors such as biting habits, digging behavior, aggressive behavior, and chasing behavior, and set the optimal intensity (Level 1: Low to Level 3: Strong) according to the dog breed and training purpose. [2 Types of LED Light Modes - Stray Dog Countermeasures & Night Walks] The flashing mode uses powerful ultrasonic waves and flashing light to intimidate and deter aggressive behavior (such as chasing and biting) from stray dogs, while the continuous lighting mode can be used as safety lighting during night walks. This product prevents stray dogs from approaching by giving them a sense of fear through the simultaneous emission of ultrasonic waves and flashing light, ensuring the safety of the owner and their dog. It also has a multi-functional design that can be used as a spare light in emergencies. [Type-C Fast Charging & Battery Overvoltage Protection Function] Built-in 650mAh large-capacity lithium battery, and an overvoltage protection circuit prevents damage during charging, as well as a real-time battery level display function to prevent sudden power outages. Fast charging via the Type-C port allows for a full charge in about 2-3 hours. [Lightweight and Compact Design & Misoperation Prevention Function] The lightweight body weighs only 86.5g and has a smooth texture.