We have seen some nices that support iOS or Android devices, but you may more like to check the OTG if you need a versatile option compatible with more devices.
The OTG is a multi purposed USB flash drive that measures 57 x 57 x 11mm. As we can see from the images, the USB drive boasts a sleek and compact design and comes with retractible USB 3.0, micro USB and Lightning connectors, so the external drive has the ability to work with Windows, Mac, iOS and Android devices and add up to 128GB extra storage for your photos, videos and songs, and USB 3.0 interface provides high-speed data transmission.
Moreover, using the three connectors, you can also use OTG as a USB charger to charge or sync your smartphone with ease, and its built-inwith 2.1A output provides on-the-go energy for your smartphone. In addition, the OTG also features built-in Bluetooth technology in order to make it serve as Bluetooth tracker to provide two-way tracking for your valuables. At last, feature allows you to capture great selfies or group photos.
The crowdfunding for OTG is in progress. You can pledge $109 for the versatile USB drive with 32GB. If you need it, head to Indiegogo for more details.