The HTC One mini features a 4.3 inch touch display with a 720 by 1280 pixel resolution compared to the 4.7 inch 1080p display on the One. At 122 grams and with a thickness of 9.25 millimeters you also get a lighter and thinner device which maintains the high quality metal design from the One.
The HTC One mini comes with a similar 4 megapixel Ultrapixel camera with a 1/3" sensor. The camera would likely perform similarly to the HTC One, but lacks Optical Image Stabilization (OIS) which greatly contributes to blur free and high quality photos in low light. The camera does however feature 1080p video capture and there is a secondary 1.6 megapixel camera for video calls.
In terms of storage the HTC One mini comes with 16GB of internal memory for all your apps, games and content. Unfortunately there is no microSD card expandability, so you may have to look elsewhere if its something you are looking for.
The smaller size also results in a reduction in battery capacity, which is currently at 1800 mAh. The One mini should get you through the day with moderate use, but don't expect anything more from it.
Just like with the HTC One, you have dual front facing speakers on the One mini. Each of these speakers has its own dedicated amplifier, and when combined with Beats Audio should result in rich, clear, distortion free audio.
In terms of software you have the latest version of Android 4.2 Jelly Bean coupled with the HTC Sense interface. This includes the HTC Zoe camera software and HTC Blinkfeed which instantly providing the user with relevant information from social networks and across the internet.
The HTC One mini is expected to launch in select markets this August and will be available globally by September. You can choose between the black and silver color variants, but the pricing is still to be revealed.