Ultrasonic Anti-Bark Device with No Collar Needed: Effectively reduces unwanted behaviors using safe ultrasonic sound—no collar, sprays or physical corrections required 4-in-1 Training Modes for Versatile Use: Choose from tone, ultrasonic, ultrasonic and flashing light, and flashlight-only modes to adapt to your dog’s needs and different training environments Rechargeable, Long-Lasting and Portable: Fully charges in 2 hours with battery life up to 15 days. Built-in wrist strap and flashlight make it perfect for daily walks, travel or in-home use Ultrasonic Frequencies for Gentle Correction: Emits sound frequencies (25kHz fixed or 20–30kHz variable) designed to get your dog’s attention safely, without discomfort or risk to their hearing Up to 30 Feet of Range--Train Indoors or Outdoors: Whether you're correcting barking inside or managing leash behavior at the park, this handheld dog training device gives you full control in a variety of settings