Eliminator&trade; Electronic Dog Repellent and Trainer with LED Flashlight / Stops Barking + Trains for Good Behavior / Ultrasonic Dog Deterrent TRAINING  Stop unwanted behavior such as barking, digging, jumping on guests, chewing on furniture. Teach your dog to stop barking and refrain from all other unwanted behavior by associating disobeying with getting bombarded with this harmless sound. 100% SAFE TO HUMANS & HARMLESS TO DOGS  Completely safe and does not harm dogs. No liquid propellant is used; thus being the most humane way to protect yourself from aggressive dogs. PROTECTS - Emits a high-pitched ultrasonic sound that's inaudible to the human ear but highly irritating to dogs. Effectively stops aggressive, barking and threatening dogs from up to 50 feet away. LED FLASHLIGHT & BATTERY POWER INDICATOR  Features also a white color LED flashlight. Flashlight is also a battery indicator; know when its time to replace the battery, when the LED flashlight is weak its time to replace the battery. This device does require one 9 bolt battery that is NOT included. PORTABLE & FITS IN POCKET  Perfect to take along while walking, jogging , cycling, etc.; dimensions is only 4 inches x 2.5 inches, and fits comfortably into your pocket. / EFFECTIVE RANGE: Works up to 50 feet / Battery: 9-volt alkaline battery (Not included) / Size: 2.5" W x 4 H