Caldwell E-Max Shadow Pro EarPlugs Bluetooth Bluetooth connection;Push button volume controls;Adjustable gain, ambient noise, and Bluetooth;Rechargeable storage case;Multiple earplug sizestable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 3700 Product Group Code: 3700B Inactive: No Prop65 Applies: Yes Prop65 Cancer Harm: Yes Prop65 Chemical: Chromium (hexavalent compounds)