Cobra's HighGear external speakers are designed to offer an exceptional combination of unsurpassed power handling, great sound, rugged construction and stunning design. The HG S500 features: Noise Canceling Filter for clear receive audio, Variable Talk-back Control that lets you monitor your voice as you transmit, ideal for aftermarket audio devices.15 Watt power handling capability, 4-inch speaker with 5.5 oz. magnet, shock resistant construction, Metal mesh grille.