When was HTC One phone first released? How does HTC One phone look like? What are the main technical specifications of HTC One phone?

The HTC One phone was released in March 2013 running Android OS. The following picture shows how an HTC One phone looks like:

The HTC One serves as a successor to HTC's 2012 flagship phone, the One X—a phone. The HTC One was developed with an emphasis on unique hardware and software features, such as an aluminum casing, a new image sensor implementation for its camera, stereo speakers, a revised version of HTC's Sense user experience, and other new software functionality such as the "BlinkFeed" news aggregator and "Zoe" camera features.

Main specifications of HTC One phone:

Manufacturer       HTC
First released     March 2013
Dimensions         137.4 x 68.2 x 9.3 mm (5.41 x 2.69 x 0.37 in)
Weight             143 g (5.0 oz)
Operating system   Android 4.1.2
CPU                1.7 GHz quad-core Krait 300
GPU                Adreno 320
Memory             2 GB LPDDR2 RAM
Storage            32 or 64 GB
Battery            2,300 mAh Li-Po
Display            120 mm (4.7 in), 1920×1080p (16:9, 468 ppi)
Rear camera        4-megapixel, 1080p HD video
Front camera       2.1-megapixel, 1080p HD video
Connectivity       Wi-Fi, GPS, NFC, Bluetooth, DLNA, Infrared, USB, HDMI