ProGrip: Reassuring Ergonomic Battery Grip for Mobile Phones by SHIFTCAM — Kickstarter
Amazon.com: ShiftCam ProGrip Starter Kit - DSLR Style Mobile Battery Grip - Wireless Shutter Button - Built in Powerbank - Qi Wireless Charging - Freestanding Dock - Tripod Mount - Works with
Need stability? Get a ShiftCam ProGrip for your smartphone by Jose Antunes - ProVideo Coalition