Specifications:

2015 Newest Model Hard Cardboard Vr Google cardboard 3D Glasses   

1.Pre-cut cardboard as unibody design
2.Best materials for the cardboard
3.Control by the neodymium silver magnetic ring
4.or NFC tag for better performance if needed
5.Private 3D movies and 3D games experience
6.Carboard Glasses for iPhone and Android
7.Easy to assemble, need no more than 3 minutes under the double-sided printing instruction

Optional accessories: (add money)

Head strap

NFC 

Head Strap:

Detachable head strap belt for Google cardboard Version 2.0 
Release your hands while watching the 3D movies. 
Elastic nylon strap with velcro, durable and adjustable. 
Specifications: 

Color: Black 
Material: Nylon 
Weight: Approx.15g / 0.5oz
A simple and inexpensive DIY Google virtual reality glasses.
Complete Kit without NFC.
Installation process is simple and can be completed within 3 minutes.
Can control your phone with the magnets.
Supports LR format besides the usual video format.
Suitable for 5.0 inch screen cellphone. 

Note: Only can look at the left-right 3D film.