Single sided helmet speaker pad with microphone by BbTALKIN. This helmet pad is designed to be used with Advance Unit. You plug the boom microphone’s 3.5mm audio cable directly into your Advance Unit to establish communication. The microphone and speaker piece on the helmet pads are completely waterproof. The design of the helmet pad allows the flexibility to change out either the microphone piece or speaker piece if it becomes damaged over time. This pad fasten to the left side of your helmet by a marine grade Velcro. These are compatible with almost every helmet. The only helmet these will not adhere to are those that are rubber painted.