3M 7100193144 Earpiece is a high-quality hearing protection device designed for ultimate comfort and safety. With a battery life of 16 hours and a lithium-ion rechargeable battery, it ensures long-lasting performance. The in-ear style and noise attenuating headsets provide excellent noise reduction. The earplugs feature a level-dependent function for ambient listening, allowing users to hear important sounds around them while still protecting their hearing. Although it does not have Bluetooth or external audio input, the communication type is ambient listening. Overall, this 3M product is a reliable choice for effective hearing protection.