This magnifier and shade hugely improves your underwater photography

Note: the next lot of info is taken directly from the UN Japanese site:
It is made in-water monitoring professional in order to better view the liquid crystal unit in underwater photography. Because of the method of fixing tighten the string, it can also be attached to those with no rail or the like on the housing side. It is useful items ♪ to firmly support the shooting in the water◎ Attach a string to the housing does not, such as rail. 
[Maximum size] 84 (W) X75 (H) X55 (D) mm 
[weight] about 108g 
[screen adaptation size] 65 (W) X50 (H) mm 
[length of the string] total length of about 280mm (inner diameter of about 140mm) 

Images : images of manual to show (second last image) manual at standard size, last image of manual as seen through the magnifying viewer.

* * * located in Yau Tong, East Kowloon * * * * collect from Yau Tong only. 

Come to convenient Yau Tong where the Green and Purple MTR line