Only activate the device when the motion sensor is triggered to maximize its power supply. Powered by amorphous solar panels-Solar energy is both economical and environmentally friendly. Solar energy means that the product does not require cables or cables-just put it in place and wait for charging. The sound includes the sound of eagles, firecrackers, artificial sounds and the crying of other animals. Suitable for electric pole towers, towers, substations, farms, orchards, fish ponds, warehouses, large workshops, food processing plants, etc.