Camera : super 20MP Auto Focus camera with a 1/2.3" BSI sensor; 27.8mm f/2.2 lens; dual-LED flash light; 2160p@30fps video capture with continuous auto focusing.
Front camera : 4 MP fixed-focus UltraPixel front-facing camera with BSI sensor; 26.8mm f/2.0 lens; HDR; 1080p video recording.
Storage : 32GB of built-in memory; microSD card slot; 100GB of free Google Drive storage for 2 years
LTE Cat.6, Wi-Fi a/b/g/n/ac, GPS with GLONASS, NFC, IR port, Bluetooth 4.1, FM radio; microUSB 2.0 port, MHL, USB host capability .
Sound system : Front-facing stereo speakers with BoomSound and Dolby Audio
2,840mAh battery; Qualcomm Quick Charge 2.0 support
Main disadvantages :
Screen has the same specs three years in a row
Non-removable battery.
No water and dust protection.
Camera lacks OIS or digital video stabilization.
HTC One series model M9 packs the same 5 inch screen as the One (M8) and that is no bad thing. It's a high-quality IPS panel of 1080p resolution, which delivers 441 ppi.