This battery powered repeller is connected to a standard garden hose, which can be left turned on as it will only shoot water when triggered. Why choose this device? The ultrasonic animal repellers can sometimes affect pets such as rabbits or guinea pigs, so with this water spray repeller you can still deter the pests in your garden without having an impact on your own animals.Batteries Four "AA" batteries will be needed to power the sensor and battery life depends on how many times the device is activated, but they typically last 3-4 months assuming 10 activations per day. Batteries aren"t supplied.