Written and produced by the duo's members, Elly Jackson and Ben Langmaid, the song was released as the album's fourth and final single on 27 September 2009.

The song has a distinctly Caribbean vibe, incorporating the Stylophone synthesiser (marketed as a children's toy in the 1960s and 1970s) as a main lead and bass sound.

David Balls of Digital Spy gave the song two out of five stars, stating, "Neither as charming as their breakthrough nor as instantly catchy as their recent chart-topper, 'I'm Not Your Toy' is a plodding and disposable effort that lacks any real magic or flare."

"[1] In a more positive review, Luke Turner of NME wrote that the song's "calypso flick no doubt had Lily Allen green-faced during La Roux's recent support slot.

"[3] The music video for "I'm Not Your Toy", directed by AlexandLiane, is set in a futuristic spa resort with tropical plants and fruits surrounding a swimming pool.