... protect 2.No need to change batteries 3.Easy o install 4.Simple Specification,Solar wireless infrared phpotoelectric beam detectorAlert ... energySuper low power consumotion(1=02mA)(the full charged system can work continuously 30 days without(sunlight)Protection range, ... ,no need to change batteries ,no maintenance ,easy to install or remove,suitable for temporaryor long-term periphery protection ,such ...