Meet NOLO for VR: a motion tracking system for mobile and Steam virtual Reality that lets you experience active gameplay in virtual environments. It consists of controllers, base station, and a headset marker. You get 6 degrees of freedom and 4 hours of battery life.
To get started, install the base station, open the Riftcat software on your PC and the VRidge app on your smartphone, fix the headset tracker on your headset, and you are ready to go. You can connect the headset marker to your PC via USB. According to the developers, NOLO has a tracking latency of less than 20ms and a range of 13 x 13ft. Like what you see? You can order yours on Kickstarter.