The solar mole snake repeller use simulation of the animal central nervous system of asoustic and shock wave propagation in underground caused discomfort and panic anxiety, making it keep away from the surface and underground of the gardens and lawns etc. Specification Material: ABS & Aluminum Solar Panel : amorphous silicon, 5.5V/45MA Rechargeable Battery(incl.): NI-MH(NI-CD)1.2V/800mAH"AA"size Effective Range: approx 800m2 Frequency: 400HZ-1000HZ Unit Size: 43.8cm*15.4cm(H*D) Box size: 39.5*15.7*10CM The advantages of the solar mole repeller: 1. With DC connector, can be charged by 3v/200mah adapter on rainny days. 2. Full capacity Ni-MH battery, eco-friendly and longer working time 3. Waterproof, with 8 screws and a thick sealant to protect the solar panel.