A standalone option refers to something that works independently and does not rely on anything else to function. It can operate on its own, without needing any additional help or support. Full definition
Additional standalone options include a Class IV trailer towing package, remote starting system and 20 - inch chrome alloy wheels. (kbb.com)
Rather, it's a fun standalone option if you just want a security camera without any fuss. (techradar.com)
Some of the great standalone options are keyless ignition / entry, a navigation system, satellite radio, heated front seats, and side window shades. (patrickcars.com)