Between device compatibility, questionable patent claims, and foreign distribution channels, each product should be approached with a bit of caution.
With the Android accessory market growing there have been an increasing number of projects offering customizable buttons for your device. This article suggests that these ad-ons may not be worth your while, though.
Pressy might be what started it all; its Kickstarter campaign raised nearly $700,000 back in October, and the gadget press was all over it.
Pre-orders are still open at $27 a pop, which gets you a small button that plugs into your Android device’s headphone jack. An accompanying app lets you assign different actions to the button, like turning on the flashlight, starting an app, taking a photo, etc. ...
Delivery was supposed to start in “Spring 2014″, but a few promised ship dates have come and gone.
Some similar products include Klick and Mi Key (both Chinese), as well as a sticker version called DIMPLE on Indiegogo,
There is a totally free way to get most of the functionality of these products, though. Instead of adding more buttons, the QuickClick app just customizes your volume buttons instead.
Source: http://www.newsforshoppers.com/does-your-android-need-more-buttons-proceed-with-caution/36721729/