This is a revolutionary device to drive those unwanted rodents out of your yard in a safe, environmental-friendly way. It works by emitting ultrasonic waves which will irritate rodents, simulate danger, and repel rodents away from the irradiated area.Feature:Powered by solar energy and rechargeable Ni-Cad battery (included) Easy and safe to use, no poison and no chemical Transmitting ultrasonic waves every 30 seconds Ideal device to keep rodents away from your garden or lawns Specifications:Effective Range: Approx. 650 square meters Frequency: 400Hz -1000Hz Rechargeable Battery Included: 1.2V 800mAh Ni-cd Solar Panel: 4.5V 45mA Panel Size (L x W): Approx. 90 x 70mm Aluminium Tube Length: Approx. 227mm Height: Approx. 13.5 inch / 34.3 cm tall from the bottom of the stake to the top of the solar panel Material: ABS and aluminium Installation:Connect the two connectors inside the aluminum bar onto the joints on the top and make sure that the colors of the joints shall match: red with red and black with black (For the first time use, please pull the green plastic cover away and charge the device for 2 - 3 daytimes) Fix the bar and the top together Insert the bar into the earth, be careful not to use excessive force lest the device be damaged (The base of the top shall be exposed outside about 1cm above the ground) Package Includes:1 x Solar rodent repeller 1 x Manual sheet Note: Firstly, please check the ground surface before using it. Frozen soil, irrigated or waterlogged ground is not suitable. Dig a hole into solid earth to place the device. The density of the soil will greatly affect the effectiveness of the device. The more solid the earth, the better the device will be functioning.