There are 3 levels of proxies according to their anonymity.

Level 1 - Elite Proxy / Highly Anonymous Proxy: The websites can't detect you are using a proxy.
Level 2 - Anonymous Proxy: The websites know you are using a proxy but can't know your real IP.
Level 3 - Transparent Proxy: The websites know you are using a proxy as well as your real IP.

Our premium list contains only anonymous proxies (Level1 + Level2).