Truengine2 makes this possible by using dual drivers in their earbuds for acoustically optimized sound at all frequencies with powerful bass, accurate mids, and crystal clear highs. The resulting HiFi sound is improved further with a built-in Truengine CrossoverTM, for perfectly balanced audio separation, creating a wider sound field for a totally immersive audio experience. Truengine2 makes phone calls crystal clear with an effective CVC noise-canceling algorithm that eliminates interference from unwanted outside noise. This feature means that volume levels can be lower and safer for listening. For longer listening sessions, Truengine2 uses a clever charging case that acts as an auxiliary power source. Combined with the latest efficient rechargeable onboard batteries, Truengine2 earbuds provide over 30 hours of continuous playing time. Made with active lifestyles in mind, Truengine2 features a patented ergonomic EarfinTM design for a secure fit for sports, exercise and daily use. They use the super stable Bluetooth 5.0 wireless protocol and with IPX5 sweat & waterproof performance. The earbuds are the perfect companion for sports lovers and busy, on-the-go people.