The inserted smartphone recognizes the NFC tag, which tells him that a pair of glasses is available. The solid magnetic switch on the left side is important to perform actions. The lenses can not be adjusted, the headgear does. The design fits securely on your head, the mobile phone holder back makes good impression. If the phone is inserted, shall be a strip of the same material on top to protect from light and is not fixable. By design, not otherwise feasible, but looks a bit fiddly. If you have fixed everything and started a suitable Cardboard app, an interesting 3D effect revealed. The camera remains free at the back, so that augmented reality is possible. 3D is not the Nexus 5 due to lack of stereoscopy unfortunately.
Overall, it's amazing how little effort zaugern with 3D glasses that cost several hundred euros per se. The smartphone display with high resolution is good enough, the computing power also. However, the construction is therefore also quite warm, display illumination and CPU contribute.
When choosing colors I chose for black, since it is known ensure bright colors for light reflections. But it may be that the white glasses inside also dyed dark. If not, you should definitely choose the black version. Pity is that headphones are not connected, you'd have to rely on stereo Bluetooth headsets. However, these have a latency that is not necessarily available for synchronous games. A Moto G 2 with stereo speakers is determined as the exciting device. So if you want to watch in 3D inside times and a more durable Cardboard investigated, should access. The guide is even partly in German, which I would not have expected.