<p><strong>Product Features</strong><br> Input/Output: 5V/2A;<br> Charging time: 2-3 hours;<br> Working Time: 3-8 hours (The lasting time depends on external temperature and heat settings)<br> Temperature: constant 107°F(42°C)/118°F(48)/131°F(55°C).</p> <p><strong>Product dimensions and weight</strong><br> Size:109mm x 58mm x 25mm (3.97in x 2.32in x 0.78in )<br> Weight:132g/4.5oz</p> <p> In any case. Short press the power switch one time will displayed as blue light. The light will show the remaining power capacity.<br> Press twice quickly to turn onor turn off the mini led light function.<br> Press and hold the power switch for 4-5 seconds to start the heating mode. The LED light will display red.<br> Press once quickly to switch between three heating modes indicated by the red lights. (Low - Medium - High temperature).<br> Press and hold the power switch for 4-5 seconds to turn off the hand warmer.</p> <p><strong>Friendly reminder</strong><br> Please Keep away from water, and do not charging and heating simultaneously.<br> Please stored in dry place when not in use;<br> Put on Cloth pouch to avoid burns when they get too hot for skin contact especially say on the wrists or behind knees where skin is thinner and more fragile.</p> <p><strong>Package Contents</strong><br> One New model Senlleo 5200mAh hand warmers.<br> One Cloth pouch with drawstring<br> One User Manual.<br> One Micro USB cable.<br> One Lanyard.</p>