Cynaps Bluetooth Bone Conduction Headset in a Hat (Light Grey) Hands-Free Bluetooth Connectivity Ears-Free Bone Conduction Audio. No Earphones required! Sound is transmitted directly to the inner ear through vibration Sweat-Free Fabric: Pulls away sweat and keeps you cool while biking or jogging Crystal clear microphone located inside the bill Talk time: 6-10 hours. Standby time: 30 days