The solar mole deterrent sends underground ultra sound waves every 30 seconds 300 700 hz which effectively deters moles and voles you dont need to use it just as a deterrent you can also use it as garden decoration when dusk falls the rainbow colours start to illuminate and go off after 4 hours technical details range up to 625 m powerful solar module 4 v 45 ma with integrated rechargeable battery nimh 12 v 800 ma material abs aluminium size approx 16 x 43 cm