?2-18 Running Hrs & 5 Speeds?4000mAh large capacity batteries provide 2-18 working hrs duration (depending on different speeds). Adjust appropriate speed by pressing the power button repeatedly.Adjusted from 3 gears to 5 gears to give customers more choices. Innovative bladeless neck fan with dual-turbine motors and 78 air outlets for powerful, all-around cooling. Simply wear it on your neck for hands-free comfort—safe for kids and seniors. Perfect for concerts, outdoor work, travel, or gym workouts, keeping you cool anytime, anywhere. Upgraded motor runs as low as 25dB — quieter than a whisper, so you can still hear your own breath. Made from smooth ABS and soft silicone, this 0.61 lb lightweight, hands-free neck fan stays comfortable and secure for all-day wear.