USB Warmer Gadget

Descriptions: Cable length about: 100cm to 115cm 1 * this round diameter of the cup cushion is 9cm, the actual working part is 3.5cm x 3cm, the temperature of the heated portion of the roller coaster surface is maintained around 50-80 degrees when it works (except the thermometer, nothing else is placed on the cup pad, then get this measurement results).2 * material: silicon, electronic component: 3.5cm x 3cm3 * connect the USB cable to the computer or to the 5v charger switch interface, coasters start to generate heat.4 * Please disconnect the USB cable when not in use, to prolong the product's life.5 * heating effect is not obvious; recommended keeping the hot water warm, it will help the tea or coffee slow down to cool (200ml of hot water long time keep warm about 35-40 degrees)6 * warm effect: adapter> power bank> computer7 * thin flat bottom glass cup and flat bottom metal cup for better heatingNotes: 1. please do not use the recessed bottom cup, thin glass flat bottom cup i