Maximum transfer speed: USB 2.0 high speed / 480Mbps (theoretical value);Number of slots: 4;Supported OS: Windows 8.1 8 7 Vista/Mac OS X 10.610.9;Dimensions: Approx. width 59.0 x depth 35.0 x height 13.0 mm (excluding cable);Weight: about 35g;Operating environment: temperature 540°C humidity 3080% (no condensation);Duration: 6 months;Accessories: Instruction manual Please note that some of the models are made exclusively for Japanese market hence the specifications and interface language is all in Japanese and cannot be changed to a different language. Also the voltage is adopted for Japanese standard ~ 100V ## About us want.IP Inc (a group company of Yahoo Japan) the leading cross-border e-retailer of all kinds of Japan products. We source all the products from official distributors or manufactures] ## Overseas Shipping Information As this is an overseas delivery product it may take up to 2~5 business days to ship out. However there may be a slight delay depending on the local delivery status and customs procedures. ## Warranty Since this product is manufactured for Japanese market warranty is not supported in your country. ## Voltage For electronic equipment it is recommended to use a transformer just in case. This is because electronic equipment for Japan is designed to be used at 100V. (Some products are globally compatible.).