HTC ONE M8 2014 Red (FACTORY UNLOCKED) 5 Full HD2.5GHz Quad-CoreUltrapixel Built-in Storage: 16 GB External Display Size: 5 Operating System: Android OS v4.4.2 (KitKat) Mobile Frequencies: Stereo FM radio with RDS Data transfer: microUSB v2.0 (MHL), USB On-the-go, USB Host, Wi-Fi Compatible Carrier & Service: Unlocked Touch Screen: LCD External Display Color: 16M colors