A startup takes to Indiegogo to launch what claims to be the thinnest iPhone battery case yet-- the Air Case, an accessory adding just 3.8mm in thickness to the smartphone.

The Air Case is compatible with the iPhone 6, 6 Plus, 6S, and 6S Plus, and weighs all of 69g. It carries a 2400mAh battery the maker claims doubles the power available to the iPhone, adding over 8 hours of use.

Mighty Cast proposes a modular means to control a wide range of devices from the wrist-- the Nex Band, a wristband featuring 5 modules users can customise via companion app and If This Then That (IFTTT) commands.

Dubbed by the company as "Mods," the Nex Band modules have a colour display, touch sensitivity, a unique digital ID and a programmable function. Users can customise each Mod through the Nex app using IFTTT-style recipes, with functions ranging from assigning a button to a smartphone function, activating a smart home device or even controlling mobile device games.

The IoT Group proposes an airborne alternative to the selfie stick-- the Roam-e, a drone able to follow users around while taking pictures of their increasingly narcissistic faces.

The ROAM-e features a twin rotor on the top and collapsible blades, making it easy to pack and carry in a bag. According to the company the drone features facial recognition able to detect users from up to 25m, ensuring they are always in shot.

In addition a Follow Me function has the drone keep a maximum 3m distance from its target.

Smartphones can power a number of devices, including PCs and virtual reality headsets, but a startup named OLO 3D takes the concept to an unlikely place with the OLO, a smartphone-powered 3D printer.

Described as a miniature stereolithography 3D printing system, the OLO is compatible with any smartphone with a display up to 5.8-inch in size, and essentially uses a combination of companion app (iOS and Android) and smartphone display to replace the projector component in a DLP printer.