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DON'T EXPOSE THE WARMER DIRECTLY TO OUTSIDE LOW TEMPERATURE, JUST PUT IT IN GIVEN LITTLE BAG OR IN YOUR POCKET , AND THIS WILL MAINTAIN AND ENSURE THE LONG LIFETIME OF WARMER HEATING. Looking for a Rechargeable Portable Hand warmer That also charges your Smartphone and other USB digital Devices? 4-10hrs HAND WARMER (up to130℉,High/Medium/Low temp. optional) - Rose gold √Battery Capacity:5200mAh √Input:5V/2A √Output:5V/2A √Product Size: L4*W2.3*H0.94 inch (102*58.8*24mm) √Product N.W.: about 4.7 OZ (133g) √Product G.W.: about 8.5 OZ (246g) √Charging Time: 2-3 hours √Working Time: 4-10 hours √Colors: Rose Gold√Packing List: 1pc Hand Warmer, 1pc Flannel bags ,1pc sling, 1pc 2A Charging Cable, 1pc user manual √Button functions: Long press (4-5sec.), power on with red-lights into Warmer mode Short press ONCE each, red-lights 3stars optional (Low/Medium/High temp.) Long press (4-5sec.), power off Short press Twice , battery showing with blue-lights Blue-lights shutoff automatically in 40sec. 5-12hours HAND WARMER - RED 7800mA √Charges via either USB or AC adapter (AC110-250V/ 50- 60Hz) √Battery Capacity:7800mAh √Input:5V/2A √Output:5V/2A √Product Size: L4.7*W2.5*H 1" inch (119*64*25mm) √Product N.W.: about 4.5 OZ (130g) √Product G.W.: about 7.8 OZ (220g) √Charging Time: 3-4 hours √Working Time: abt 5-12 hours √Colors: RED √Packing List: 1pc Hand Warmer, 1pc USB adapter line ,1pc USB line, 1pc user manual