For Professional Pigeon, Starling, Sparrow and Seagull Bird Repeller - Enhanced Version by GSla

Residential Electronic Bird Repeller. Sound Pressure-90 dB at 1 meter. Frequency Range-15 to 25 kHz (adjustable). Working Current-less than 200 mAAdjustable settings, offers up to 900 square feet of coverageSilent to most humans, safe, humane, easy to operate, and effective; harmless to children and petsBattery operated with A/C option- includes 50-foot extension cordKeeps pest birds off your balcony, porch, or deck.