KKSB Cases offers Arduino Micro available with 4KB Flash memory for bootloader.
Feature 1 - {The USB (Built-in) helps the board to connect just like a keyboard or a mouse}
Specification 1 - { Supports 5V (operating voltage)}
Specification 2 - {Voltage limit ranges from 6V to 20V}.
Specification 3 - {12 analog input channels}.