SPECIFICATION: 1.Keep coffee / tea / drink warming or cooling 2.Plug and play,easy installation, no driver required, 3.With On-Off and LED indicator 4.Stainless steel Plate : Ion polished to keep the perfect efficiency 5.Quality insulation material around the metal plate to prevent injury 6.Chains up to 127 outer devices,USB 1.1/2.0 Compliant 7.System: Win95 OSR2/98/se/Me/2000/XP, Linux/Mac systems 8.CE ,RoHS 9.Guarantee: 1 year TECHNICAL PARAMETER 1.Warming degree: 45~60,Chilling defgree:8~12 2.Power: DC 5V ,Powered by USB 3.Work Current: 40mA 4.Rated power: 0.5W/3.5W PACKING CONTENTS: 1. USB Warmer&Chiller & Hub With USB Cable 2. User manual