UCLEAR Digital Pulse Wired Drop-in High Definition Helmet Speakers Compatible with iPhone and Android OS Upgrade your audio experience with the Pulse drop-in speakers from UCLEAR Digital. Featuring a gold-plated, standard 3.5mm stereo audio jack and 40mm diameter driver. Pulse speakers plug into most helmet communication systems, audio devices, and Smartphones. High Fidelity Audio, gives you HD quality sound inside almost any helmet Includes speaker set and installation mount set.