Feature:1.Size(Approx.):16mm*19mm*96mm/0.63"*0.75"*3.78"2. OTG and charge at the same time.3. compatible with most tablet pc windows system in the market. 4. with free micro usb to usb adapter， also use for desktop and laptop as a 4-ports hub. If you have 2 or 3 tablets and laptops with different model， you can resolve many problems only buy this universal otg hub.Our hub is with 3 switchs， Below models are tested ok， if your model is not in the list， please confirm with us before you buy. Switch 1 can use for below models.for Asus VivoTab Note 8 / M80ta(otg+maintain power，charge sign will be disappeared)for Asus T100ta(otg+charge， charge sign will be disappeared， but in fact it is charged)for Acer W4-820for Lenovo Miix 2 8 Switch 2 can use for below models.for Dell V8P Venue 8 profor Asus ME-400Cfor Teclast X98 3G， X98Air， X98 Air 3G， X98 Air II，X89H，X89HD，X80H，X90HD.for Onda V975I(win 8.1 system)for Onda V819I(win 8.1 system)for Onda V891W(win 9.1 system)for Cube iwork 7， iwork 8for Chuwi VI8， VX8 3G(win 8.1 system)，V10HD.for Livefan F8Cfor Ramos i8profor Ployer momo8wfor Pipo W4， W5，W2Ffor Vido W8Cfor IFIVE MX2for Pioneer W10for Colorful I818Wfor HP Stream 7for Lenovo miix 3. Switch 3 can use for below models.for Toshiba WT8for Lenovo thinkpad 8. This hub also can use for below model(keep swtich 2)for Samsung mobile(S3， S4， Note 2 ， Note 3， GALAXY J， N5100， Tab S - T800)for SONY LT18ifor VIVO xplay3sfor MOTO XT928 This hub don't support Android system if not in our list. Ramos i9s Onda V961W and Onda V919 3G air can't use this hub. Please read below before buying. and aslo don't forget to remark your tablet Model No. if your tablet is WT8 and Thinkpad8. If you find your tablet can't OTG+Charge at the same， please press the power key of your tablet and hold at least 10 seconds to force shut down your tablet. and then restart it and connect the hub again， you can use. Remark:1.If you want to use the OTG function only， just use the position 1 to connect to your tablet or phone and don't need to connect to the power.2.Some win8.1 tablets could activate its OTG and charging by the following way. As this tablet is on working stage， press the power bottom for about 10 seconds and ignore any notification showed by tablet until the shut-down process is completed. Then， reboot the tablet and wait for the accomplishment of all windows boot process. Adjust the switch of OTG HUB to position 2 and connect OTG HUB to the tablet， followed by connecting OTG HUB to power through the charging wire in package. Then， enjoy it!3. As you use OTG HUB in asus T100TA， you need to connect OTG HUB to T100TA first， followed by connect OTG HUB to power. You will see the sign of charging became "no charging" or "inactive". You don't worry about this sign， because it actually is charging!4.As you start connecting this OTG HUB to Asus M80TA in charging mode (position 1)， the battery level of M80TA will be maintained at starting level (for example: 80%) no matter how much time has passed (instead of increasing the battery level) until disconneted. The benefit of this effect is that you do'nt need to stop your work temporarily (about 6~10 hours) to charge the tablet because of the only Micro-USB port occupied by your USB mouse or keyboard.5. As you use OTG HUB to newly Nexus 7 (LTE)， you must connect it to power first， followed by connecting to Nexus 7 (LTE).6. The following process is required for successfully using OTG HUB in Nextbook 8 (win8.1). As this tablet is on working stage， press the power bottom for about 10 seconds and ignore any notification showed by tablet until the shut-down process is completed. Then， reboot the tablet and wait for the accomplishment of all windows boot process. Adjust the switch of OTG HUB to position 2 and connect OTG HUB to the tablet， followed by connecting OTG HUB to power through the charging wire in package. Then， enjoy it!7. As OTG HUB is used to charge W4-820 to full battery state (100%)， the W4-820 will actively stop the charging ability and not allow USB charger to provide current to W4-820 anymore， evenly the charger still connected on OTG HUB. After the time point of 100% bettery level， the tablet start to consume its bettery and totally ignore the connected USB charger. Moreover， the tablet will show wrong bettery level (100%) to you. So， as you start to use W4-820 after a long time charging， you can only use tablet for 5 minutes.To avoid this problem to occur again， after the 100% bettery is reached， you need to disconnect the charger from OTG HUB. By doing this， the tablet will show you real bettery level. If you want to charge overnight or for a long time， please use position 2 of HUB switch to charge W4-820 without OTG function. Its effect will be like direct charging. By this way， the tablet will show you the real bettery level after a long time charging.8.The item don't include charging wire，you can use the original charging wire of your tablet or smart phone.