IP = International Protection rating
X = Dust ingress not specified/tested.
8 = Can be immersed beyond 1M.
The specifics the manufacturer must divulge in the specs or the cert is invalid.
Per http://www.sunwayman.com/html/products/201308/138.html the depth is 2m.
Per http://www.sunwayman.com/html/products/201308/138.html the depth is 2m.