The David Clark Company Incorporated HBT-40 Industrial Bluetooth Communication Headset is ideal for use with cell phones, 'ruggedized' tablets, computers - Bluetooth 4.0 technology pairs seamlessly with virtually any industrial smart device. Provides clear communication with the added benefit of OSHA-compliant hearing protection. High fidelity earphones provide superior audio performance. A noise-canceling microphone ensures clear, crisp voice transmission. Comfort features make this headset easy to wear during long hours of use, and the HBT-40 headset provides 80 hours of continuous use on a full charge, so it's always ready to work when you are.