Specifications: Model: DZ-901 Product size: 8cm x 5cm x 2.5 Cable length: 16cm Product weights: 44g Color :White Quantity :1PCSMain Features:1.100% Brand New & Unused in original retail package 2.DZ-901 is an OTG product with card reader and 3 ports hub. 3.No installation driver is needed， compatible with Win XP/Vista/7/8， Linux， Mac， Android. 4.Use as normal card reader or usb hub， also links several devices (mouse/keyboard/flash disk/joystick) to the OTG Android Smartphones or Pads 5.Connect Keyboard or mouse through OTG combo to your Android tablets， to work as small PC 6.Link several devices to your mobile phone or pad: card reader， support TF/SD Card 7.Extra Micro USB Port as Power supply 8.Please ensure your phone/tablet pc has OTG (On-The-Go)function 9.Please note: SD Card alot and TF Card slot cannot be used at the same time 10.The 3 USB Ports can only connect to low power consumption USB devices， like mouse， keyboard 11.Hard Disk and other large power consumption USB devices， such as hard disk are not recommended 12.The 3 USB Ports and 1 card reader slot can be used at the same time， but in consideration of power consumption， it's not suggested to use all 3 USB ports when the power of your devices in in low level.