1. The Vibrating Rodent Repeller emits a low-frequency sound that vibrates the ground in a circular pattern. Rodent senses the vibration and moves away from it. The vibration will be blocked by solid objects, such as building foundations. Covers extend in a circle from the unit. 2. Power supplied by 4*D cell(1.5V) batteries, A set of batteries should last 4-6 months. Check regularly and remove if the ground becomes waterlogged or frozen. 3. Before using for the first time, Install batteries: We recommend using high-quality batteries. The unit takes 4*D cell batteries. Place in an area covered by loose soil, for example, a vegetable garden or flower bed. Be very careful to ensure the top is securely fitted and therefore watertight. 4. How to install in the ground: Dig the hole in the area where the pests are found, don't hammer the unit into the ground, as this will damage it. Carefully place the unit into the hole, ensuring that the soil comes up to 2/3 of the unit (excluding the removable top). 5. The coverage area depends on the soil type: Heavy clay soil gives the greatest coverage, and light sandy soil gives the lowest coverage. Normally is around 650 square meters. PRODUCT FEATURES Aosion Battery Sonic Rodent Repelle Materials: AB Power Supply: 4*D batteries(not included Function: Sonic+ vibratin Frequency: 400-1000H Coverage: 650sq. APPLICATION: Garden, Yard, Manor, Farm..... OEM, ODM SUPPORT