MAXAH OTG Adapter USB Hub External Card Reader Compatible with Samsung Galaxy S3 S4 S5 S7 S7 Edge Note 2 Note 3 Note 4 Note 5 Nexus 4 Nexus 5 Nexus 6 Nexus 7 LG G3 LG G5 Samsung Galaxy Tab 4. 10.1 Sam Please make sure that your particular device supports OTG via the Micro USB port before purchase! If not sure, please check your manual/specifications! Compatible with: Samsung Galaxy S3 S4 S5 S7 S7 Edge Note 2 Note 3 Note 4 Note 5 Nexus 4 Nexus 5 Nexus 6 Nexus 7 LG G3 LG G5 Samsung Galaxy Tab 4. 10.1 Samsung Galaxy Tab S2 tablet ASUS TF201 Acer A500 and other devices which feature Micro USB port and support and OTG function. Plug and play. Support USB flash drives, thumb drives, external hard drives, most USB keyboards and mouses. Supports MS, M2, SD(HC), SDHC, MMC, MMC2, RS MMC, UITRA2 SD, EXTREME SD, EXTREME 3 SD, TF (Micro-SD). NOTE: The 3 USB ports can be connected at the same time, but only one memory card can be used at any one time. USB 2.0 data transmission, with this handy piece of kit, you can easily organise your photos, watch films or access your data. e.g. read micro sd card from your Dash Cam on your cellphone, transfer pictures from camera sd card to your cellphone, copy files from your protable hard drives to your cellphone etc. This OTG adapter also allows you to type messages and use your mouse just like you were connected to your PC. Just plug in a PC mouse then a PC keyboard and your cellphone will respond instantly. NOTES: this USB hub CAN NOT charge your device. It won't add any charge when using for data transfer but, it won't drain any device when in use either. It does need external power source to run an external hard drive (no need for usb drives). A USB power lead for this USB hub is included, power adapter (5V 1A) not included. Using the power connection would extend phone battery but not charge phone battery. This USB hub CAN NOT charge a smartphone or a tablet because of the technical OTG specification. When using the power connector it does not charge the phone, it does need the power connection to run an external hard drive but not for the flash drives. Using the power connection would extend phone battery but not charge phone battery. This samsung galaxy card reader can read NO MORE than 1 card at a time. The 3 USB ports can be connected at the same time. Not compatible with some mouses and keboards.