... Extreame Whether!-Windproof and waterproof-Applications:Winter wear,winter sports,motocycle riders,hikers,hunters,ice fishing,senior citizens.-Safe ... and wear-resistingetc.2. Safety & reliability: equipped with special power adapter and 3.7 V li-battery, the input voltage ... products.4. Easy using: design for optional charging, USB or power adapter at home , li-batterysupply outdoor, easy to operate. ...