。
It's nothing special, but please accept it.
Literal
Boring thing [copula-ですが] please-accept-with-a-smile [polite-ください].
A classic Japanese gift-giving formula. つまらないものですが ('it's a boring/trivial thing, but...') is a set humble phrase used when presenting a gift — the speaker deliberately downplays the gift's value as a show of modesty. ご笑納ください ('please accept it with a smile') is formal/humble: 笑納 (しょうのう) literally means 'laughing acceptance,' and the prefix ご adds honorific weight. This self-deprecating framing is a quintessential example of Japanese 謙遜 (けんそん, modesty) culture.