Pet Life ® Vibrange 1-to-2 Dog 450 Yard Range 16-Level Vibration and Sound Training Dog Collar provides approximately 450 Yards of range and is Non-Shock or safer alternative to E-Shock with 3 Modes located on the transmitter that quickly activates the options for Vibration, Sound with simultanious Sound and Vibration. Additionally, the transmitter features a Keypad Lock safety function that prevents accidental usage or activation when carrying with an intensity level button that provides 8-Levels of sounds with 16 intensity levels of Vibration that is further showcased on the LCD display screen including battery level. The Vibrange Transmitter features a 2-Channel toggle option that can train upto 2 dogs at once (Additional receivers sold seperately).