This unit repels birds pigeons and seagulls suitable for use against birds in gardens vineyards fields roofs public buildings boats and other places the fine tuned electronics provide constant functionality technical specifications frequency 24 65 khz 10 max 75 db battery 2 x aa mignon 850 mah rechargeable batteries included effective range approx 7 m power led light flash charging using usb cable charging time approx 12 hours or via solar cell speakers 3 piezo speake