がついてる

is on; is attached

→ が
phrase Rare #21,330
is on; is attached The exact meaning depends on context: it can mean that something is switched on, attached to something, included with something, or accompanying someone. This is the casual spoken form of がついている.
JA: このカバンには小さなポケットがついてる。
EN: This bag has a small pocket attached.

お姉ちゃんがついてる

Your big sister's got your back.

— 箪笥<たんす> (2003)

僕には妖精がついてる

I've got a fairy with me.

— ほんとうのピノッキオ (2019)

あのバスエアコンがついてるかな

I wonder if that bus has air conditioning.

白いベルトがついてる方がいい

I prefer the one with the white belt.

工場とはがついてる

Have you gotten things worked out with the factory?

— 紅の豚 (1992)

ただ番号がついてる

It’s just numbered.

— 大人は判ってくれない (1959)

このパンカビがついてる

This bread has mold on it.

たくさんのがついてる

It has a lot of translations, doesn't it?

白いベルトがついてるのがいい

I’d like one with a white belt.