AOER CB Radio Scanner External Speaker HAM Radio Audio Communication Speaker EKS-3 Impedance: 4 ;Jack size:  3.5mm Max Power: 5 Watts; Length of wires: approx. 16ft (5m) Color: Black;Weight: 13oz Features: adjustable angle bracket;Dimension: approx. 4-"(W) x 2-"(H) x 2-"(D) Compatible with Radio models: YAESU VERTEX STANDARD ICOM KENWOOD Radio.