GooseBuster Sonic Goose Repeller Specifications Dimensions: Control Unit 9" x 9" x 5.25", speakers 10" x 8" x 5" Speakers : 8 ohms, 30 watts Weight: 16 pounds Coverage: One unit: 5 to 7 acres (2 to 2.8 hectares) Two units: 15 to 21 acres (6 to 8.4 hectares) Power Requirements: 1 amp 110 or 220vAC adaptor, or 12vDC Sound Pressure: 0 - 110 dB @ 1 meter (each speaker) Frequency: 500 to 1,500 Hz Compliance: Supply power source is CUL and CE listed. EPA Est. 075310-OR-001 Included: Control unit, four speakers with 100' cords, mounting hardware,complete instructions,AC power adaptor with cord, AC powered timer. Buy It NOW 110 v 12v