Immerse yourself in rich, crystal-clear sound thanks to a wide 20Hz-20KHz frequency range, ensuring you hear every detail, from thumping bass to shimmering highs. Power through your day: Charge up in just 1.5 hours and enjoy over 220 hours of standby time, so you’re always ready for the next tune. Built for the active lifestyle: The K-4 is sweatproof and secure, staying put through your toughest workouts and commutes. 32ft of wireless freedom lets you roam without restrictions, while intuitive controls on the neckband keep you in control. Rock it in sleek black and experience unmatched performance, convenience, and affordable audio excellence. Why choose the K-4? 48 hours of playtime: Listen long and loud without interruption. Crystal-clear sound: Immerse yourself in rich, detailed audio. Sweatproof and secure: Built for active lifestyles. Fast charging: Refuel in just 1.5 hours. Over 220 hours of standby time: Always ready to power your day. Affordable price: Unmatched value for exceptional sound.