Curtail barking of small or timid dogs Features: Lightest collar (1 ounce) Most effective for small dogs Uses sound to interrupt and deter barking Adjustable sensitivity Uses PetSafe RFA-67 Manual included Collar Specs: Height: 1" Width: 2" Depth: 1" Frequency: 4 kHz General Info: Volume is about 105 dB at 1 foot Emits high pitched tone as correction that is audible to humans Battery life is about 30 days, depending on number of activations Uses microphone to sense for barking Can not be used with a leash attached Must be fit properly or may not function reliably Not recommended to use for more than 8 hours at a time