【Safe Sonic Frequency】: Utilizes a safe 25KHz sonic frequency to deter barking without harming your dog. 【Rechargeable Feature】: This device is rechargeable, eliminating the need for constant battery replacement. 【Effective Range】: Operates effectively within a 50-foot range, making it convenient for various training scenarios. 【Indoor/Outdoor Use】: Equipped for both indoor and outdoor settings, increasing its usability in different environments. 【Professional Training Tool】: Designed as a professional training tool to assist in dog obedience and behavior management.