Volume Limiting (VL) Technology Available. Available only on industrial Plugfones products, WorkSafe Volume Limiting Technology keeps speaker volume below 82 dB and compliant with OSHA’s max volume guidelines. The jack contains strategically placed resistors to restrict volume levels from reaching the full capabilities of the attached device. SoundSeal noise-suppressing technology minimizes environmental noise to give you an immersive, unparalleled listening experience. It acts as a barrier between you and everything you don’t want to hear, creating an atmosphere singular to you and your music. With Bluetooth 5.0 you can listen to a Bluetooth-enabled smart device from at least 33 feet away. Some users have reported a range of over 100 feet with direct line-of-sight. Stay comfortable and protected for longer with the NeverOut Battery. Featured on wireless Plugfones, NeverOut gives you up to 12 hours of play time with a full charge. All wireless Plugfones feature Fast Charge, the technology that gets you two hours of play time for only five minutes of charging. You work hard-and so should your earplugs. Industrial Plugfones products feature TuffCord, a flexible and tear-resistant cable that protects the wires of your favorite earplug-earbuds. The mic identifies, isolates, and kills environmental noise so the person on the other end of the call can hear you, not what’s going on around you. Control your music and manage calls with the Quickdraw Easy Access Control. Ruggedized buttons allow you to play or pause, answer or end calls, adjust volume, progress through songs, and more. FreeReignT Wireless Earplug-Earbud Hybrid. (2) Pairs Interchangeable Foam Plugs. (2) Pairs Interchangeable Silicone Plugs. WorkSafeT Volume Limiting (VL) Technology Available. Bluetooth® 5.0 Wireless Technology. Never OutT Battery – Up to 12 Hours of Play. IsoTalkT Noise Isolating Mic. QuickdrawT Easy Access Control. Independently Tested and Compliant With ANSI S3.19-1974 Noise Reduction Standards as Certified by Michael & Associates, Inc. Unique Patent Pending Design. Weight: 0.6 ounces (16 grams).