Instant redirect mode - the short URL will forward visitors directly to target URL.
Cloaked redirect mode - your URL will be opened within invisible frame on zTi.me and visitors will not see the target domain and URL unless they open source code.
Middle page mode - this site will show page with countdown for few seconds - then visitor will be automatically redirected to target URL. This is typically used when adding advertisements to your shortened URL.
Framed redirect mode (shared links in rating section of this site) - similar to cloaked mode but frame will be visible and may contain advertisement. This is typically used when adding advertisements to your shortened URL.