Features: All-natural lemon scent is safe and effective Cannot be set off by another dog's bark Waterproof Low battery indicator Low spray indicator On/Off switch Emits up to 80 sprays per refill, over twice the amount of any other brand Uses a 6-volt silver alkaline battery (included) Manual included Collar Specs: Height: 1.5" Width: 2" Depth: 1.5" Weight: 3.2 oz One black plastic sensor probe, center Replacement nylon collar: RFA-130 General Info: Sensor probe cannot be removed or adjusted Uses vibration sensor to sense for barking Should not be worn with other collars as they may set the collar off Cannot attach leash to collar Must be fit properly or may not function reliably Not recommended to use for more than 8 hours at a time Dog should be at least 8 lbs.