HTC announced the new HTC One A9 smartphone in September 2015 and released it on November the same year that comes up with an Android OS v6.0 (Marshmallow) which is upgradable to v6.0.1 (Marshmallow).
This phone has a dimension of 145.8 x 70.8 x 7.3 mm (5.74 x 2.79 x 0.29 in) with 7.3 mm thickness and weighs about 143 grams. This phone supports GSM/ HSPA/ LTE network configurations. It uses Nano-SIM technology. The display is of 16 M colors and has AMOLED capacities touchscreen.
Screen size is 5.0 inches, and the screen-to-body ratio is 66.8%. The screen resolution is 1080 x 1920 pixels which are precisely 441 PPI pixel density. It supports multi touch and comes up with Corning Gorilla Glass 3 protection with HTC Sense UI 6.0. It has got Qualcomm MSM 8952 Snapdragon 617 chipset, and CPU comprises of Quad-core 1.5 GHz Cortex-A53 & quad-core 1.2 GHz Cortex-A53 processors. The GPU used is Adrenal 405.
The internal memory available is 16 GB containing 2 GB RAM and 32 GB that includes 3 GB RAM. It also supports micro SD slot that could be upgraded up to 200 GB (dedicated slot).
The primary camera comprises of a 13 MP, f/2.0, 28 mm, autofocus, OIS, dual-LED (dual tone) flash camera while secondary comprises of 4 MP, f/2.0, 27 mm, 1/3″ sensor size, 2µm pixel size, 1080 [email protected] fps and HDR.
The video feature is  1080 [email protected] fps, 72 0p @120 fps and HDR. The camera features include Geo-tagging, touch focus, face detection, panorama, and HDR. The microphone jack is 3.55 mm with Dolby Audio/ Hi-Res Audio and has got stereo loudspeakers. The WLAN supported are Wi-Fi 802.11 b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, and hotpots. The Bluetooth version is v4.1, A2DP, apt-X.
It also comes with NFC connection and the GPS technology used is A-GPS, GLONASS. It also contains FM radio. It also comes with a compass, fingerprint, accelerate, gyro and proximity sensors. The messaging can be performed via MMS, SMS threaded view, Email and Push mail. The browser is HTML 5. It comes with fast battery charging technology Quick Charge v2.0 that costs 60% in just 30 mins.
The battery used is Non-removable Li-Po 2150 mAH battery giving the talk time up to 16 h(3 G), up to 423 h (3 G) standby and music play up to 60 h having the endurance rating of 46 h. The colors available are Carbon Gray, Opal Silver, Topaz Gold, Deep Garnet, and Pink. The main disadvantages of this phone are the battery is Non-removable battery, there is no IrDA port, no fast charger provided. It has a non-competitive price outside the USA.