Someone at LG must have thought: "Leather is so last-year, let's do something nobody has done - or long quit trying." And here we have the LG G5. It has the looks of a brand new flagship, the heart of a dragon and an adventurous dual camera setup suited for every occasion. But there's more than meets the eye, the Magic Slot. The LG G5 is a modular smartphone, which lets you plug a handful of external add-ons: a semi-pro camera grip with shutter buttons and a bigger battery, or an external sound amplifier by B&O.
Source: http://www.gsmarena.com/lg_g5-review-1416.php