... can be designed, suppliers and distributors can choose it as promoting and advertising gifts; Considerate design, no national bunderies propagandization, wonderful ... temperature of 40-60 , easy to install, no need-driven, hot-swappable2) Voltage Rating: 2.5 W-5V DC, a single ... power source required.5)Provide the CE ,FCC,ROHS certifications. hot selling usb hub warmer from shenzhen factory