What is the fine-grained topic of the following text: Just download an app called TrinusVR (only for Android) This 3D VR headset is compatible with: iPhone 6 plus / 6s , Samsung Galaxy S6 edge plus/ S6 Edge/ S5/ S4, Google Nexus 4/ 5/ 6, HTC One, Xiaomi Mi3 TV box and Laptop, PPT etc Features: You will not feel visual fatigue and dizzy even you use long time with the resin lens The 3D Glasses is made of ABS and spherical resin lens materials without stimulation plastic sheet that is environmentally friendly, fully enclosed designed The distance between the phone and the lens design can be adjusted so that it suits for people with different visions Secret images, other people cannot see anything except to the wearer himself Convenient to use for watching at any time anywhere whether sitting, lying or standing Package includes 1 x VR 3D glasses. Only return the topic.
The fine-grained topic of the text is about a 3D VR headset compatible with various devices and its features.