A Cryptocurrency Hardware wallet is a physical device like a USB Pendrive which stores the private keys on the device itself instead of on any computer. (kryptomoney.com)
Moreover I tried connecting pendrive using OTG cable and it did not detect, OTG is not supported. (gogi.in)
Sir I am confused between Asus Zenphone 4 A400CG and A400CXG, what are the differences and Both these models Supports USB OTG pendrive function. (gogi.in)