15W 4-Ohm 5" Loud Hailer Speaker with Bracket & Talkback - WhiteShakespeare marine speakers are rated from 5W to 40W power, covering radio output and hailer/listen-back applications. All are engineered to withstand the rigors of the marine environment.HS-5A Hailer Horn Speaker is made with a durable plastic weather-proof construction. 5" with 15 watts, this hailer is compact but efficient.Specifications: Size: 5" 4-Ohm Max Power: 15W Specifications: Impedance: 4-Ohm Power - Output (Watts): 15W Shape: Round Box Dimensions: 6"H x 6"W x 7"L WT: 1.2 lbs UPC: 719441151171