* USB - OTG
With a USB OTG cable USB sticks work fine, even an external 2.5 "drive with 300GB works, should be one and only one question of power consumption, older 150 GB 2.5" disk is not working.
Mouse and keyboard have also been recognized.
* Writing and reading, from Android 4.4.2 may Apps (from 3 manufacturers) write only in their directory on the SD card.
The pre-installed file manager can ensure the entire SD - card Edit! With me are the locus of maps on the SD card - reading is not a problem
Who therefore can not handle may take the path on the root:
* Root rights (habs course not tried): Google would sometimes ask to "[GUIDE] [ROOT] [RECOVERY] Lenovo A3500-H".
* Built-in radio (in conjunction with headphones)
* GPS sensitivity, no differences detected on my Galaxy Nexus.
Conclusion: For flash offer price of 79 euros an unbeatable offer.