NYHNHY Portable Handheld Fan, 4000mAh Battery Operated Rechargeable Personal Fan, 6-15 Hours Working Time for Outdoor Activities, Summer Gift

ALWAYS MAINTAIN COOL YOU WANT : The majority of handheld fan Only last 3 hours at highest speed and then last couple hours at medium or slow speed until turn off, it is not customers expected for longer working time, But YunTuo fan can meet your expectation. We specifically engineered fixed speed setting with 4000mAh rechargeable battery, our portable fan maintains 10 hours at highest speed, it won't weaker until the battery run out unless you change the speed, keep you cool as you want. HELP YOUR HOT FLASHES : This hand held fan comes with brand new copper made motor, is able to generate up to 4304 RPM in the maximum speed, which is powerful enough that can support the blade running at very high speed to produce strong wind, always cool you down anywhere. KEEP YOU ALWAYS SAFE : The battery life and safe is what customer worried and concerned, with our newly designed batteries, it uses over electric current protection and low voltage protection to avoid overcharge and over discharge,